Remove extra test flags from all commands

Currently all commands are being build with extra flags. The extra
flags appear because of a direct import of the testing package from
the fake_etcd_client.go source file.

Remove the direct import of the testing package. Add a tools.T
interface to support existing behavior. Also clean up two TODO items
by remove using of the expectError and expectNoError functions.

Fixes #579

pkg/kubelet/config/config_test.go

@@ -24,20 +24,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet"
 )
 
-// TODO: remove this
-func expectError(t *testing.T, err error) {
-	if err == nil {
-		t.Errorf("Expected error, Got %v", err)
-	}
-}
-
-// TODO: remove this
-func expectNoError(t *testing.T, err error) {
-	if err != nil {
-		t.Errorf("Expected no error, Got %v", err)
-	}
-}
-
 func expectEmptyChannel(t *testing.T, ch <-chan interface{}) {
 	select {
 	case update := <-ch: