some manual py2 cleanups

tests/commands/clean_test.py

@@ -1,6 +1,6 @@
 import os.path
+from unittest import mock
 
-import mock
 import pytest
 
 from pre_commit.commands.clean import clean

tests/commands/init_templatedir_test.py

@@ -1,6 +1,5 @@
 import os.path
-
-import mock
+from unittest import mock
 
 import pre_commit.constants as C
 from pre_commit.commands.init_templatedir import init_templatedir

tests/commands/install_uninstall_test.py

@@ -1,8 +1,7 @@
 import os.path
 import re
 import sys
-
-import mock
+from unittest import mock
 
 import pre_commit.constants as C
 from pre_commit.commands.install_uninstall import CURRENT_HASH

tests/commands/run_test.py

@@ -2,8 +2,8 @@ import os.path
 import pipes
 import sys
 import time
+from unittest import mock
 
-import mock
 import pytest
 
 import pre_commit.constants as C

tests/commands/try_repo_test.py

@@ -1,8 +1,7 @@
 import os.path
 import re
 import time
-
-import mock
+from unittest import mock
 
 from pre_commit import git
 from pre_commit.commands.try_repo import try_repo