Add functional tests for "image" command v2

The tests for image v2 are quite similar to the tests for v1.
The only difference things are:
1. v2 "image set" command only allows to change the disk format
   for a queued image
2. v2 "image show" command output is different from v1

Change-Id: Ieb6bec7467887aab567743153ea3181afa49537d

Author: Tang Chen

functional/tests/image/v2/__init__.py

@@ -0,0 +1,67 @@
+#    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.
+
+import os
+import uuid
+
+from functional.common import test
+
+
+class ImageTests(test.TestCase):
+    """Functional tests for image. """
+
+    NAME = uuid.uuid4().hex
+    OTHER_NAME = uuid.uuid4().hex
+    HEADERS = ['Name']
+    FIELDS = ['name']
+
+    @classmethod
+    def setUpClass(cls):
+        os.environ['OS_IMAGE_API_VERSION'] = '2'
+        opts = cls.get_show_opts(cls.FIELDS)
+        raw_output = cls.openstack('image create ' + cls.NAME + opts)
+        expected = cls.NAME + '\n'
+        cls.assertOutput(expected, raw_output)
+
+    @classmethod
+    def tearDownClass(cls):
+        # Rename test
+        raw_output = cls.openstack('image set --name ' + cls.OTHER_NAME + ' '
+                                   + cls.NAME)
+        cls.assertOutput('', raw_output)
+        # Delete test
+        raw_output = cls.openstack('image delete ' + cls.OTHER_NAME)
+        cls.assertOutput('', raw_output)
+
+    def test_image_list(self):
+        opts = self.get_list_opts(self.HEADERS)
+        raw_output = self.openstack('image list' + opts)
+        self.assertIn(self.NAME, raw_output)
+
+    def test_image_show(self):
+        opts = self.get_show_opts(self.FIELDS)
+        raw_output = self.openstack('image show ' + self.NAME + opts)
+        self.assertEqual(self.NAME + "\n", raw_output)
+
+    def test_image_set(self):
+        opts = self.get_show_opts([
+            "disk_format", "visibility", "min_disk", "min_ram", "name"])
+        self.openstack('image set --min-disk 4 --min-ram 5 ' +
+                       '--public ' + self.NAME)
+        raw_output = self.openstack('image show ' + self.NAME + opts)
+        self.assertEqual("raw\n4\n5\n" + self.NAME + '\npublic\n', raw_output)
+
+    def test_image_metadata(self):
+        opts = self.get_show_opts(["name", "properties"])
+        self.openstack('image set --property a=b --property c=d ' + self.NAME)
+        raw_output = self.openstack('image show ' + self.NAME + opts)
+        self.assertEqual(self.NAME + "\na='b', c='d'\n", raw_output)