Merge "Use unittest.mock instead of mock"

lower-constraints.txt

@@ -53,7 +53,6 @@ Mako==1.0.7
 MarkupSafe==1.0
 mccabe==0.2.1
 microversion_parse==0.2.1
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6

watcher/tests/decision_engine/datasources/test_manager.py

@@ -16,7 +16,7 @@
 
 from unittest import mock
 
-from mock import MagicMock
+from unittest.mock import MagicMock
 
 from watcher.common import exception
 from watcher.decision_engine.datasources import gnocchi