Update to use unittest.mock for python3

.gitignore

@@ -2,4 +2,5 @@ build
 opt
 dist
 .idea
-*__pycache__*
+*__pycache__*
+*.pyc

tst/test/rdklib_clientfactory_test.py

@@ -1,5 +1,5 @@
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 import botocore
 
 CODE = __import__('clientfactory')

tst/test/rdklib_evaluator_test.py

@@ -1,6 +1,6 @@
 import json
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 import botocore
 from rdklib import InvalidParametersError
 

tst/test/rdklib_util_evaluations_test.py

@@ -1,6 +1,6 @@
 import json
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 from rdklib.configrule import ConfigRule
 from rdklib.evaluation import ComplianceType, Evaluation
 

tst/test/rdklib_util_external_test.py

@@ -1,5 +1,5 @@
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 
 CODE = __import__('external')
 

tst/test/rdklib_util_service_test.py

@@ -1,6 +1,6 @@
 import json
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch, MagicMock
 import botocore
 
 CODE = __import__('service')