Update vendored dependencies.

[danielmai]

Found all external dependencies with govendor list. Each external dependency is marked as e in the list output:

$ govendor list | awk '$1 == "e" { print }'

 e  github.com/apache/thrift/lib/go/thrift
 e  github.com/dgraph-io/dgo/x
 e  github.com/dgrijalva/jwt-go
 e  github.com/dustin/go-humanize/english
 e  github.com/golang/protobuf/jsonpb
 e  github.com/golang/protobuf/proto
 e  github.com/golang/protobuf/ptypes
 e  github.com/golang/protobuf/ptypes/any
 e  github.com/golang/protobuf/ptypes/duration
 e  github.com/golang/protobuf/ptypes/struct
 e  github.com/golang/protobuf/ptypes/timestamp
 e  github.com/google/uuid
 e  github.com/hashicorp/golang-lru/simplelru
 e  github.com/prometheus/client_golang/prometheus
 e  github.com/prometheus/client_golang/prometheus/internal
 e  github.com/prometheus/client_golang/prometheus/promhttp
 e  github.com/prometheus/client_model/go
 e  github.com/prometheus/common/expfmt
 e  github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg
 e  github.com/prometheus/common/model
 e  github.com/prometheus/procfs
 e  go.opencensus.io
 e  go.opencensus.io/internal
 e  go.opencensus.io/internal/tagencoding
 e  go.opencensus.io/metric/metricdata
 e  go.opencensus.io/metric/metricexport
 e  go.opencensus.io/metric/metricproducer
 e  go.opencensus.io/plugin/ocgrpc
 e  go.opencensus.io/resource
 e  go.opencensus.io/stats
 e  go.opencensus.io/stats/internal
 e  go.opencensus.io/stats/view
 e  go.opencensus.io/tag
 e  go.opencensus.io/trace
 e  go.opencensus.io/trace/internal
 e  go.opencensus.io/trace/propagation
 e  go.opencensus.io/trace/tracestate
 e  go.opencensus.io/zpages
 e  go.opencensus.io/zpages/internal
 e  golang.org/x/crypto/ssh/terminal
 e  golang.org/x/net/context
 e  golang.org/x/net/http2
 e  golang.org/x/net/http2/hpack
 e  golang.org/x/net/internal/timeseries
 e  golang.org/x/net/trace
 e  golang.org/x/sync/semaphore
 e  golang.org/x/sys/windows
 e  google.golang.org/api/support/bundler
 e  google.golang.org/genproto/googleapis/rpc/status
 e  google.golang.org/grpc
 e  google.golang.org/grpc/balancer
 e  google.golang.org/grpc/balancer/base
 e  google.golang.org/grpc/balancer/roundrobin
 e  google.golang.org/grpc/binarylog/grpc_binarylog_v1
 e  google.golang.org/grpc/codes
 e  google.golang.org/grpc/connectivity
 e  google.golang.org/grpc/credentials
 e  google.golang.org/grpc/credentials/internal
 e  google.golang.org/grpc/encoding
 e  google.golang.org/grpc/encoding/gzip
 e  google.golang.org/grpc/encoding/proto
 e  google.golang.org/grpc/grpclog
 e  google.golang.org/grpc/health
 e  google.golang.org/grpc/health/grpc_health_v1
 e  google.golang.org/grpc/internal
 e  google.golang.org/grpc/internal/backoff
 e  google.golang.org/grpc/internal/balancerload
 e  google.golang.org/grpc/internal/binarylog
 e  google.golang.org/grpc/internal/channelz
 e  google.golang.org/grpc/internal/envconfig
 e  google.golang.org/grpc/internal/grpcrand
 e  google.golang.org/grpc/internal/grpcsync
 e  google.golang.org/grpc/internal/syscall
 e  google.golang.org/grpc/internal/transport
 e  google.golang.org/grpc/keepalive
 e  google.golang.org/grpc/metadata
 e  google.golang.org/grpc/naming
 e  google.golang.org/grpc/peer
 e  google.golang.org/grpc/resolver
 e  google.golang.org/grpc/resolver/dns
 e  google.golang.org/grpc/resolver/passthrough
 e  google.golang.org/grpc/stats
 e  google.golang.org/grpc/status
 e  google.golang.org/grpc/tap

Vendored in each external dependency:

govendor update github.com/dgraph-io/dgo/...
govendor update github.com/pkg/errors/...

govendor update dgrijalva/jwt-go/...

govendor update google/uuid/...

govendor update github.com/hashigcorp/golang-lru/simplelru/...

govendor update github.com/prometheus/client_golang/prometheus/...

govendor update github.com/prometheus/client_model/go/...

govendor update github.com/prometheus/common/...

govendor update github.com/prometheus/procfs/...

govendor update github.com/dustin/go-humanize/english/...

govendor update github.com/apache/thrift/lib/go/thrift/...

# OpenCensus
govendor update go.opencensus.io
govendor update go.opencensus.io/internal/...
govendor update go.opencensus.io/internal/tagencoding/...
govendor update go.opencensus.io/metric/metricdata/...
govendor update go.opencensus.io/metric/metricexport/...
govendor update go.opencensus.io/metric/metricproducer/...
govendor update go.opencensus.io/plugin/ocgrpc/...
govendor update go.opencensus.io/resource/...
govendor update go.opencensus.io/stats/...
govendor update go.opencensus.io/stats/internal/...
govendor update go.opencensus.io/stats/view/...
govendor update go.opencensus.io/tag/...
govendor update go.opencensus.io/trace/...
govendor update go.opencensus.io/trace/internal/...
govendor update go.opencensus.io/trace/propagation/...
govendor update go.opencensus.io/trace/tracestate/...
govendor update go.opencensus.io/zpages/...
govendor update go.opencensus.io/zpages/internal/...

govendor update google.golang.org/api/support/bundler/...

govendor update google.golang.org/genproto/googleapis/rpc/status/...

govendor update golang.org/x/crypto/ssh/terminal/...
govendor update golang.org/x/net/context/...
govendor update golang.org/x/net/http2/...
govendor update golang.org/x/net/http2/hpack/...
govendor update golang.org/x/net/internal/timeseries/...
govendor update golang.org/x/net/trace/...
govendor update golang.org/x/sync/semaphore/...
govendor update golang.org/x/sys/windows/...
govendor update golang.org/x/sys/unix/...

# Protobuf and gRPC
govendor update github.com/golang/protobuf/jsonpb/...
govendor update github.com/golang/protobuf/proto/...
govendor update github.com/golang/protobuf/ptypes/...
govendor update github.com/golang/protobuf/ptypes/any/...
govendor update github.com/golang/protobuf/ptypes/duration/...
govendor update github.com/golang/protobuf/ptypes/struct/...
govendor update github.com/golang/protobuf/ptypes/timestamp/...
govendor update google.golang.org/grpc                                                    
govendor update google.golang.org/grpc/balancer/...
govendor update google.golang.org/grpc/balancer/base/...
govendor update google.golang.org/grpc/balancer/roundrobin/...
govendor update google.golang.org/grpc/binarylog/grpc_binarylog_v1/...
govendor update google.golang.org/grpc/codes/...
govendor update google.golang.org/grpc/connectivity/...
govendor update google.golang.org/grpc/credentials/...
govendor update google.golang.org/grpc/credentials/internal/...
govendor update google.golang.org/grpc/encoding/...
govendor update google.golang.org/grpc/encoding/gzip/...
govendor update google.golang.org/grpc/encoding/proto/...
govendor update google.golang.org/grpc/grpclog/...
govendor update google.golang.org/grpc/health/...
govendor update google.golang.org/grpc/health/grpc_health_v1/...
govendor update google.golang.org/grpc/internal/...
govendor update google.golang.org/grpc/internal/backoff/...
govendor update google.golang.org/grpc/internal/balancerload/...
govendor update google.golang.org/grpc/internal/binarylog/...
govendor update google.golang.org/grpc/internal/channelz/...
govendor update google.golang.org/grpc/internal/envconfig/...
govendor update google.golang.org/grpc/internal/grpcrand/...
govendor update google.golang.org/grpc/internal/grpcsync/...
govendor update google.golang.org/grpc/internal/syscall/...
govendor update google.golang.org/grpc/internal/transport/...
govendor update google.golang.org/grpc/keepalive/...
govendor update google.golang.org/grpc/metadata/...
govendor update google.golang.org/grpc/naming/...
govendor update google.golang.org/grpc/peer/...
govendor update google.golang.org/grpc/resolver/...
govendor update google.golang.org/grpc/resolver/dns/...
govendor update google.golang.org/grpc/resolver/passthrough/...
govendor update google.golang.org/grpc/stats/...
govendor update google.golang.org/grpc/status/...
govendor update google.golang.org/grpc/tap/...

Make sure that gRPC is locked to release version v1.20.1:

govendor fetch google.golang.org/[email protected]

Remove unused vendor dependencies. In govendor list unused vendored packages are marked as u.

govendor remove github.com/MakeNowJust/heredoc

---

This change is 

[campoy]

This change is necessary so people not using govendor will be able to use dgraph, but it seems they were already vendored?

Changed the title to "updating vendored dependencies" maybe.

Other than that, LGTM

[gitlw]

Reviewable status: 0 of 552 files reviewed, all discussions resolved (waiting on @manishrjain)

[manishrjain]

Reviewed 552 of 552 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved