chore: Switch from govendor to dep

[sudo-suhas]

dep is slated to be the official Go dependency management tool. It is ready for production use. This PR switches from govendor to dep. I also renamed the examples folders to _examples so that the dependencies are not pulled in by dep.

Packages used by examples removed from vendor:

• github.com/dustin/go-broadcast
• github.com/gin-gonic/autotls
• github.com/manucorporat/stats
• github.com/thinkerou/favicon
• golang.org/x/crypto/acme/autocert
• golang.org/x/sync/errgroup

Almost all other dependency revisions were changed to more recent commits:

pkg	Old	New
github.com/golang/protobuf	5a0f697c	130e6b02
github.com/json-iterator/go	36b14963	6240e1e7 (v1.0.3)
github.com/mattn/go-isatty	57fdcb98	0360b2af (v0.0.3)
github.com/stretchr/testify	976c720a	69483b4b (v1.1.4)
github.com/ugorji/go	c88ee250	f76f59a9
golang.org/x/net/context	d4c55e66 (release-branch.go1.7)	a04bdaca
gopkg.in/go-playground/validator.v8	5f57d222 (v8.18.1)	5f1438d3 (v8.18.2)
gopkg.in/yaml.v2	a5b47d31	eb3733d1

Note: The revision was not changed for the package github.com/gin-contrib/sse.

[codecov]

Codecov Report

Merging #1128 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1128   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files          16       16           
  Lines        1721     1721           
=======================================
  Hits         1664     1664           
  Misses         49       49           
  Partials        8        8

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[appleboy]

@javierprovecho @tboerger Please help to review this.

[douglarek]

Maybe we should wait for vgo: https://research.swtch.com/vgo

[carllhw]

Any progress ?

[hellupline]

aditional info: vgo required semver tag to contain levels of version, the current 1.2 does not check in vgo
it should be at least 1.2.0

currently vgo will only match with 1.1.4

[yushine]

Any progress ?
@sudo-suhas

[sudo-suhas]

Closing this PR as it is very much out of date and there is no indication that this would be accepted.

[thinkerou]

@sudo-suhas thank you work, I think we may use vgo later on.

[thinkerou]

ref #1569