Remove versionutils use in cli framework

The oslo-incubator version utils module requires oslo log to be pulled
in. This causes conflicts with tempest's use of oslo.log, so for the
time being this commit removes the uses of versionutils from the
library.

tempest_lib/tests/cli/test_cli.py

@@ -1,58 +0,0 @@
-# Copyright 2014 IBM Corp.
-#
-#    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 mock
-import testtools
-
-from tempest_lib.cli import base as cli
-from tempest_lib import exceptions
-from tempest_lib.tests import base
-
-
-class TestMinClientVersion(base.TestCase):
-    """Tests for the min_client_version decorator."""
-
-    def _test_min_version(self, required, installed, expect_skip):
-
-        @cli.min_client_version(client='nova', version=required)
-        def fake(self, expect_skip):
-            if expect_skip:
-                # If we got here, the decorator didn't raise a skipException as
-                # expected so we need to fail.
-                self.fail('Should not have gotten past the decorator.')
-
-        with mock.patch.object(cli, 'execute',
-                               return_value=installed) as mock_cmd:
-            if expect_skip:
-                self.assertRaises(testtools.TestCase.skipException, fake,
-                                  self, expect_skip)
-            else:
-                fake(self, expect_skip)
-            mock_cmd.assert_called_once_with('nova', '', params='--version',
-                                             merge_stderr=True)
-
-    def test_min_client_version(self):
-        # required, installed, expect_skip
-        cases = (('2.17.0', '2.17.0', False),
-                 ('2.17.0', '2.18.0', False),
-                 ('2.18.0', '2.17.0', True))
-
-        for case in cases:
-            self._test_min_version(*case)
-
-    @mock.patch.object(cli, 'execute', return_value=' ')
-    def test_check_client_version_empty_output(self, mock_execute):
-        # Tests that an exception is raised if the command output is empty.
-        self.assertRaises(exceptions.TempestException,
-                          cli.check_client_version, 'nova', '2.18.0')