Catch v3 keystone unauthorized error when creating stack

If v3 keystone unauthorized error raise during creating stack,
then this stack will remaid in status of create_in_progress. This
patch modify heat keystoneclient to catch unauthorized error and
set stack status to failed.

Closes-Bug: #1376213
Change-Id: I9a34c20fc6ac3ce235aaba4eac25a6d5ceb43f5f
Merge "Catch v3 keystone unauthorized error when creating stack"