Identity(Keystone) notifications have a handler
for Role that has event type as identity.role.*
Another for RoleAssignment which accepts
identity.role_assignment.* events.
Since event types are regular expressions,
an event like identity.role_assignment.created
is matched with identity.role.* and gets incorrectly
routed to the Role Handler.
This fix restricts the event type regex for Role
handler to just identity.role.* events and excludes
identity.role_* events.
Change-Id: I526467ef2f8204e8093f7470b86949e3e0e69990
Closes-Bug: #1457785
02bab799ba