Delete deprecated API versions

pkg/service:

There were a couple of references here just as a reminder to change the
behavior of findPort. As of v1beta3, TargetPort was always defaulted, so
we could remove findDefaultPort and related tests.

pkg/apiserver:

The tests were using versioned API codecs for some of their encoding
tests. Necessary API types had to be written and registered with the
fake versioned codecs.

pkg/kubectl:

Some tests were converted to current versions where it made sense.

pkg/kubectl/cmd/exec_test.go

@@ -106,14 +106,6 @@ func TestExec(t *testing.T) {
 		pod                                         *api.Pod
 		execErr                                     bool
 	}{
-		{
-			name:      "v1beta1 - pod exec",
-			version:   "v1beta1",
-			podPath:   "/api/v1beta1/pods/foo",
-			execPath:  "/api/v1beta1/pods/foo/exec",
-			nsInQuery: true,
-			pod:       execPod(),
-		},
 		{
 			name:      "v1beta3 - pod exec",
 			version:   "v1beta3",