Allow staging via krel for kubetest

This adds a new `--use-krel` flag to kubetest to indicate that we want
to stage the sources directly via the API provided by k/release rather
than the deprecated push-build.sh script (lives in k/release, too).

The idea is to add another job later on for testing this flag on a non
critical Kubernetes build+push job (should live in sig-release).

Signed-off-by: Sascha Grunert <[email protected]>

go.mod

@@ -30,7 +30,7 @@ require (
 	github.com/Azure/azure-storage-blob-go v0.8.0
 	github.com/Azure/go-autorest/autorest v0.10.2
 	github.com/Azure/go-autorest/autorest/adal v0.8.3
-	github.com/GoogleCloudPlatform/testgrid v0.0.13
+	github.com/GoogleCloudPlatform/testgrid v0.0.30
 	github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46
 	github.com/andygrunwald/go-gerrit v0.0.0-20190120104749-174420ebee6c
 	github.com/andygrunwald/go-jira v1.12.0
@@ -54,7 +54,7 @@ require (
 	github.com/google/go-cmp v0.5.2
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/gofuzz v1.1.0
-	github.com/google/uuid v1.1.1
+	github.com/google/uuid v1.1.2
 	github.com/gorilla/csrf v1.6.2
 	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/securecookie v1.1.1
@@ -63,7 +63,7 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.6.6
 	github.com/influxdata/influxdb v0.0.0-20161215172503-049f9b42e9a5
 	github.com/jinzhu/gorm v1.9.12
-	github.com/klauspost/pgzip v1.2.1
+	github.com/klauspost/pgzip v1.2.5
 	github.com/mattn/go-zglob v0.0.2
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826
 	github.com/pelletier/go-toml v1.8.0
@@ -74,20 +74,20 @@ require (
 	github.com/prometheus/common v0.10.0
 	github.com/satori/go.uuid v1.2.0
 	github.com/shurcooL/githubv4 v0.0.0-20191102174205-af46314aec7b
-	github.com/sirupsen/logrus v1.6.0
-	github.com/spf13/cobra v1.0.0
+	github.com/sirupsen/logrus v1.7.0
+	github.com/spf13/cobra v1.1.1
 	github.com/spf13/pflag v1.0.5
 	github.com/tektoncd/pipeline v0.13.1-0.20200625065359-44f22a067b75
 	go.uber.org/zap v1.15.0
 	gocloud.dev v0.19.0
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b
-	golang.org/x/net v0.0.0-20200904194848-62affa334b73
-	golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
+	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b
+	golang.org/x/oauth2 v0.0.0-20201109201403-9fd604954f58
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
-	golang.org/x/tools v0.0.0-20200918232735-d647fc253266
-	google.golang.org/api v0.32.0
+	golang.org/x/tools v0.0.0-20201110124207-079ba7bd75cd
+	google.golang.org/api v0.35.0
 	gopkg.in/fsnotify.v1 v1.4.7
 	gopkg.in/robfig/cron.v2 v2.0.0-20150107220207-be2e0b0deed5
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
@@ -96,8 +96,9 @@ require (
 	k8s.io/client-go v11.0.1-0.20190805182717-6502b5e7b1b5+incompatible
 	k8s.io/code-generator v0.19.3
 	k8s.io/klog v1.0.0
-	k8s.io/klog/v2 v2.2.0
-	k8s.io/utils v0.0.0-20200912215256-4140de9c8800
+	k8s.io/klog/v2 v2.4.0
+	k8s.io/release v0.6.0
+	k8s.io/utils v0.0.0-20201110183641-67b214c5f920
 	knative.dev/pkg v0.0.0-20200711004937-22502028e31a
 	mvdan.cc/xurls/v2 v2.0.0
 	sigs.k8s.io/boskos v0.0.0-20200617235605-f289ba6555ba