Pass region_name argument to keystone client

Change-Id: If82bd7fe5680faef6e56abb6f76d203b7296beb5
Closes-Bug: #1228063
Replace OpenStack LLC with OpenStack Foundation

Change-Id: Ia007da282714d8ee7337fd3b51f6dcc3b64d7ec3
Fixes-Bug: #1214176
Merge "Replace OpenStack LLC with OpenStack Foundation"
Merge "Pass region_name argument to keystone client"