e2e: accept context from Ginkgo

Every ginkgo callback should return immediately when a timeout occurs or the
test run manually gets aborted with CTRL-C. To do that, they must take a ctx
parameter and pass it through to all code which might block.

This is a first automated step towards that: the additional parameter got added
with

    sed -i 's/\(framework.ConformanceIt\|ginkgo.It\)\(.*\)func() {$/\1\2func(ctx context.Context) {/' \
        $(git grep -l -e framework.ConformanceIt -e ginkgo.It )
    $GOPATH/bin/goimports -w $(git status | grep modified: | sed -e 's/.* //')

log_test.go was left unchanged.

test/e2e_node/gcp/gke_environment_test.go

@@ -18,6 +18,7 @@ package gcp
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"os"
 	"os/exec"
@@ -111,7 +112,7 @@ var _ = SIGDescribe("GKE system requirements [NodeConformance][Feature:GKEEnv][N
 		e2eskipper.RunIfSystemSpecNameIs("gke")
 	})
 
-	ginkgo.It("The required processes should be running", func() {
+	ginkgo.It("The required processes should be running", func(ctx context.Context) {
 		cmdToProcessMap, err := getCmdToProcessMap()
 		framework.ExpectNoError(err)
 		for _, p := range []struct {
@@ -125,10 +126,10 @@ var _ = SIGDescribe("GKE system requirements [NodeConformance][Feature:GKEEnv][N
 			framework.ExpectNoError(checkProcess(p.cmd, p.ppid, cmdToProcessMap))
 		}
 	})
-	ginkgo.It("The iptable rules should work (required by kube-proxy)", func() {
+	ginkgo.It("The iptable rules should work (required by kube-proxy)", func(ctx context.Context) {
 		framework.ExpectNoError(checkIPTables())
 	})
-	ginkgo.It("The GCR is accessible", func() {
+	ginkgo.It("The GCR is accessible", func(ctx context.Context) {
 		framework.ExpectNoError(checkPublicGCR())
 	})
 })