Upgrading client-go and adding context parameter to client-go functio…

…n calls (#372)

* Upgrading client-go.
* Adding context parameter to the client go function calls.

Signed-off-by: Raj Das <mail.rajdas@gmail.com>

go.mod

@@ -3,9 +3,8 @@ module github.com/prometheus/test-infra
 go 1.12
 
 require (
-	cloud.google.com/go v0.39.0
+	cloud.google.com/go v0.56.0
 	github.com/google/go-github/v29 v29.0.3
-	github.com/google/gofuzz v1.0.0 // indirect
 	github.com/googleapis/gnostic v0.2.0 // indirect
 	github.com/imdario/mergo v0.3.7 // indirect
 	github.com/kr/pretty v0.2.0 // indirect
@@ -16,24 +15,18 @@ require (
 	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/common v0.4.1
 	github.com/sergi/go-diff v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.3 // indirect
 	golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d // indirect
-	golang.org/x/net v0.0.0-20200222125558-5a598a2470a0 // indirect
-	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421
-	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect
-	golang.org/x/tools v0.0.0-20190729092621-ff9f1409240a
-	google.golang.org/api v0.5.0
-	google.golang.org/genproto v0.0.0-20190516172635-bb713bdc0e52
-	google.golang.org/grpc v1.19.0
+	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
+	golang.org/x/tools v0.0.0-20200331025713-a30bf2db82d4
+	google.golang.org/api v0.27.0
+	google.golang.org/genproto v0.0.0-20200331122359-1ee6d9798940
+	google.golang.org/grpc v1.28.0
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/src-d/go-git-fixtures.v3 v3.5.0
 	gopkg.in/src-d/go-git.v4 v4.13.1
-	gopkg.in/yaml.v2 v2.2.4
-	k8s.io/api v0.0.0-20190409021203-6e4e0e4f393b
-	k8s.io/apiextensions-apiserver v0.0.0-20190409022649-727a075fdec8
-	k8s.io/apimachinery v0.0.0-20190404173353-6a84e37a896d
-	k8s.io/client-go v11.0.1-0.20190409021438-1a26190bd76a+incompatible
-	k8s.io/utils v0.0.0-20190506122338-8fab8cb257d5 // indirect
-	sigs.k8s.io/yaml v1.1.0 // indirect
+	gopkg.in/yaml.v2 v2.3.0
+	k8s.io/api v0.18.4
+	k8s.io/apiextensions-apiserver v0.18.4
+	k8s.io/apimachinery v0.18.4
+	k8s.io/client-go v0.18.4
 )