Add e2e aggregator test.

What this PR does / why we need it:
This adds an e2e test for aggregation based on the sample-apiserver.
Currently is uses a sample-apiserver built as of 1.7.
This should ensure that the aggregation system works end-to-end.
It will also help detect if we break "old" extension api servers.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes
fixes #43714
Fixed bazel for the change.
Fixed # of args issue from govet.
Added code to test dynamic.Client.

test/e2e/framework/framework.go

@@ -43,6 +43,7 @@ import (
 	clientreporestclient "k8s.io/client-go/rest"
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
+	aggregatorclient "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 	"k8s.io/kubernetes/pkg/kubemark"
@@ -71,6 +72,7 @@ type Framework struct {
 
 	InternalClientset *internalclientset.Clientset
 	StagingClient     *staging.Clientset
+	AggregatorClient  *aggregatorclient.Clientset
 	ClientPool        dynamic.ClientPool
 
 	SkipNamespaceCreation    bool            // Whether to skip creating a namespace
@@ -195,6 +197,8 @@ func (f *Framework) BeforeEach() {
 		Expect(err).NotTo(HaveOccurred())
 		f.InternalClientset, err = internalclientset.NewForConfig(config)
 		Expect(err).NotTo(HaveOccurred())
+		f.AggregatorClient, err = aggregatorclient.NewForConfig(config)
+		Expect(err).NotTo(HaveOccurred())
 		clientRepoConfig := getClientRepoConfig(config)
 		f.StagingClient, err = staging.NewForConfig(clientRepoConfig)
 		Expect(err).NotTo(HaveOccurred())