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/cpu_manager_test.go

@@ -523,7 +523,7 @@ func runCPUManagerTests(f *framework.Framework) {
 		}
 	})
 
-	ginkgo.It("should assign CPUs as expected based on the Pod spec", func() {
+	ginkgo.It("should assign CPUs as expected based on the Pod spec", func(ctx context.Context) {
 		cpuCap, cpuAlloc, _ = getLocalNodeCPUDetails(f)
 
 		// Skip CPU Manager tests altogether if the CPU capacity < 2.
@@ -596,7 +596,7 @@ func runCPUManagerTests(f *framework.Framework) {
 			pod.Spec.Containers[0].Name, pod.Name)
 	})
 
-	ginkgo.It("should assign CPUs as expected with enhanced policy based on strict SMT alignment", func() {
+	ginkgo.It("should assign CPUs as expected with enhanced policy based on strict SMT alignment", func(ctx context.Context) {
 		fullCPUsOnlyOpt := fmt.Sprintf("option=%s", cpumanager.FullPCPUsOnlyOption)
 		_, cpuAlloc, _ = getLocalNodeCPUDetails(f)
 		smtLevel := getSMTLevel()