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: I67fcc16530f1c46eecb62e27eb7b88d1dee6f9df
Signed-off-by: Takashi Natsume <takanattie@gmail.com>

lower-constraints.txt

@@ -27,9 +27,7 @@ kombu==4.1.0
 linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==1.4
-mox3==0.20.0
 msgpack-python==0.4.0
 msgpack==0.5.6
 netaddr==0.7.18

os_vif/tests/unit/internal/ip/linux/test_impl_pyroute2.py

@@ -10,7 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 from pyroute2 import iproute
 from pyroute2.netlink import exceptions as ipexc
 from pyroute2.netlink.rtnl import ifinfmsg

os_vif/tests/unit/internal/ip/test_api.py

@@ -12,7 +12,7 @@
 
 import importlib
 
-import mock
+from unittest import mock
 
 from os_vif.internal.ip import api
 from os_vif.tests.unit import base

os_vif/tests/unit/internal/ip/windows/test_impl_netifaces.py

@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 import netifaces
 
 from os_vif.internal.ip.windows import impl_netifaces as ip_lib

os_vif/tests/unit/test_base.py

@@ -11,7 +11,8 @@
 # under the License.
 
 import copy
-import mock
+
+from unittest import mock
 
 from oslo_serialization import jsonutils
 from oslo_versionedobjects import base

os_vif/tests/unit/test_os_vif.py

@@ -10,7 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 from stevedore import extension
 

vif_plug_linux_bridge/tests/unit/test_linux_net.py

@@ -10,17 +10,19 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
-import testtools
 
 import fixtures
-from os_vif.internal.ip.api import ip as ip_lib
+import testtools
+
 from oslo_concurrency import lockutils
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_config import fixture as config_fixture
 from oslo_log.fixture import logging_error as log_fixture
 
+from os_vif.internal.ip.api import ip as ip_lib
+
 from vif_plug_linux_bridge import linux_net
 from vif_plug_linux_bridge import privsep
 

vif_plug_linux_bridge/tests/unit/test_plugin.py

@@ -10,7 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 import testtools
 
 from os_vif import objects

vif_plug_ovs/tests/functional/ovsdb/test_ovsdb_lib.py

@@ -10,14 +10,16 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
 import random
 
+from unittest import mock
+
+import testscenarios
+
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_utils import uuidutils
 from ovsdbapp.schema.open_vswitch import impl_idl
-import testscenarios
 
 from vif_plug_ovs import constants
 from vif_plug_ovs import linux_net

vif_plug_ovs/tests/unit/ovsdb/test_ovsdb_lib.py

@@ -10,7 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 import testtools
 
 from oslo_concurrency import processutils

vif_plug_ovs/tests/unit/test_linux_net.py

@@ -11,8 +11,10 @@
 # under the License.
 
 import glob
-import mock
 import os.path
+
+from unittest import mock
+
 import testtools
 
 from os_vif.internal.ip.api import ip as ip_lib

vif_plug_ovs/tests/unit/test_plugin.py

@@ -10,7 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
+
 import testtools
 
 from os_vif.internal.ip.api import ip as ip_lib