Use unittest.mock instead of third party mock

Now that we no longer support py27, we can use the standard library
unittest.mock module instead of the third party mock lib.

Change-Id: I35d6f1207b57ea40809f78785c69a13c2943e1bc
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

solumclient/tests/builder/test_client.py

@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
 
 from solumclient.builder import client
 from solumclient.common.apiclient import exceptions

solumclient/tests/common/test_auth.py

@@ -12,8 +12,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from unittest import mock
+
 from keystoneclient.v2_0 import client as ksclient
-import mock
 import testtools
 
 from solumclient.common import auth

solumclient/tests/common/test_client.py

@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
 import requests
+from unittest import mock
 
 from solumclient.common.apiclient import auth
 from solumclient.common.apiclient import client as api_client

solumclient/tests/common/test_cliutils.py

@@ -13,8 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from unittest import mock
+
 import fixtures
-import mock
 
 from solumclient import client as solum_client
 from solumclient.common import cli_utils

solumclient/tests/common/test_github.py

@@ -14,8 +14,8 @@
 # limitations under the License.
 
 import json
+from unittest import mock
 
-import mock
 
 from solumclient.common import github
 from solumclient.tests import base

solumclient/tests/common/test_yamlutils.py

@@ -10,7 +10,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
 import yaml
 
 from solumclient.common import yamlutils

solumclient/tests/test_client.py

@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
 
 from solumclient import client
 from solumclient.common.apiclient import exceptions

solumclient/tests/test_solum.py

@@ -13,13 +13,13 @@
 # under the License.
 
 from io import StringIO
+from unittest import mock
 
 import collections
 import re
 import sys
 
 import fixtures
-import mock
 
 from oslo_utils import uuidutils
 

solumclient/tests/v1/test_plan.py

@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
 
 from solumclient.common.apiclient import client
 from solumclient.common.apiclient import fake_client

test-requirements.txt

@@ -9,4 +9,3 @@ oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
-mock>=2.0.0 # BSD