Complete removal of dependency on the "mock" package

Remove sphinx from test-requirements.txt as the whole doc building is
is fixed in this patch: https://review.opendev.org/721994

Change-Id: I7a065a0cde1344af38655c9f136526eaa2524923

lower-constraints.txt

@@ -45,7 +45,6 @@ logutils==0.3.5
 Mako==1.0.7
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack-python==0.5.6

neutron_taas/tests/unit/extensions/test_taas.py

@@ -13,7 +13,7 @@
 #    under the License.
 
 import copy
-import mock
+from unittest import mock
 from webob import exc
 
 from oslo_utils import uuidutils

neutron_taas/tests/unit/extensions/test_vlan_filter.py

@@ -14,8 +14,8 @@
 #    under the License.
 
 import copy
+from unittest import mock
 
-import mock
 from neutron_taas.common import constants as taas_consts
 from neutron_taas.extensions import taas as taas_ext
 from neutron_taas.extensions import vlan_filter as vlan_filter_ext

neutron_taas/tests/unit/services/drivers/test_linux_sriov_nic_driver.py

@@ -14,7 +14,7 @@
 
 
 import copy
-import mock
+from unittest import mock
 
 from neutron_taas.services.taas.drivers.linux import sriov_nic_exceptions \
     as taas_exc

neutron_taas/tests/unit/services/drivers/test_linux_sriov_utils.py

@@ -18,8 +18,8 @@
 #
 
 import copy
-import mock
 import re
+from unittest import mock
 
 from neutron_taas.common import utils as common_utils
 from neutron_taas.services.taas.drivers.linux import sriov_nic_exceptions \

neutron_taas/tests/unit/services/taas/test_taas_plugin.py

@@ -15,8 +15,8 @@
 
 import contextlib
 
-import mock
 import testtools
+from unittest import mock
 
 from neutron_lib import context
 from neutron_lib import rpc as n_rpc

neutron_taas/tests/unit/taas_client/test_cli20_tapflow.py

@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 #
-import mock
 import sys
+from unittest import mock
 
 from neutron_taas.taas_client import tapflow
 from neutronclient import shell

neutron_taas/tests/unit/taas_client/test_cli20_tapservice.py

@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 #
-import mock
 import sys
+from unittest import mock
 
 from neutron_taas.taas_client import tapservice
 from neutronclient import shell

test-requirements.txt

@@ -6,8 +6,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
 psycopg2>=2.7.5 # LGPL/ZPL
 PyMySQL>=0.7.6 # MIT License
 oslosphinx>=4.7.0 # Apache-2.0