Remove enumerate calls

Refactor keystone/tests/test_v3_auth.py, remove all useless enumerate
calls in for loop. To make codes cleaner.

Change-Id: I16d6796fb37b543c1301c2f35129384f2e0ff782
Add notifications module

This adds notifications framework including a notifications
module and corresponding test cases.

blueprint notifications

Change-Id: Iad2391c98d7fb1f5283997159cc90eb093bb42bb
Merge "Add notifications module"
Merge "Remove enumerate calls"