Fix use of docker removed ParseRepositoryTag() function

Docker has removed the ParseRepositoryTag() function in
leading to failures using the kubernetes Go client API.

Lets use github.com/docker/distribution reference.ParseNamed()
instead.

Failure:

../k8s.io/kubernetes/pkg/util/parsers/parsers.go:30: undefined: parsers.ParseRepositoryTag

pkg/util/parsers/parsers_test.go

@@ -0,0 +1,49 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package parsers
+
+import (
+	"testing"
+)
+
+// Based on Docker test case removed in:
+// https://github.com/docker/docker/commit/4352da7803d182a6013a5238ce20a7c749db979a
+func TestParseImageName(t *testing.T) {
+	testCases := []struct {
+		Input string
+		Repo  string
+		Image string
+	}{
+		{Input: "root", Repo: "root", Image: "latest"},
+		{Input: "root:tag", Repo: "root", Image: "tag"},
+		{Input: "root@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", Repo: "root", Image: "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
+		{Input: "user/repo", Repo: "user/repo", Image: "latest"},
+		{Input: "user/repo:tag", Repo: "user/repo", Image: "tag"},
+		{Input: "user/repo@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", Repo: "user/repo", Image: "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
+		{Input: "url:5000/repo", Repo: "url:5000/repo", Image: "latest"},
+		{Input: "url:5000/repo:tag", Repo: "url:5000/repo", Image: "tag"},
+		{Input: "url:5000/repo@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", Repo: "url:5000/repo", Image: "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
+	}
+	for _, testCase := range testCases {
+		repo, image, err := ParseImageName(testCase.Input)
+		if err != nil {
+			t.Errorf("ParseImageName(%s) failed: %v", testCase.Input, err)
+		} else if repo != testCase.Repo || image != testCase.Image {
+			t.Errorf("Expected repo: '%s' and image: '%s', got '%s' and '%s'", "root", "", repo, image)
+		}
+	}
+}