Fix update.py can't replace base name

update.py scans 'from openstack.common.*' to replace base name while
syncing, there is another import style 'import openstack.common.*'.
This patch handles this case.

Closes-Bug: #1304774
Change-Id: I29caef5faff2ec7b2eebd5c61bcf39f91e6e9265
Merge "Fix update.py can't replace base name"