gitc_utils: Remove unused import; add missing import

shutils is not used. Remove it.

sys is used, but not imported.  Import it.

Change-Id: I4ee582f33bbd451601097ef2f20bee23b54764cd

gitc_utils.py

@@ -15,7 +15,7 @@
 
 from __future__ import print_function
 import os
-import shutil
+import sys
 
 import git_command
 import git_config