Logging user out after self password change

Admin users where not logged out after changing their own password in the user
settings pannel, and error messages where displayed afterwards.

Fixes bug 1226829

Change-Id: Iec0e34484e2bbc28a300d6259aab1a682e4a00ff
(cherry-picked from commit 0aab590)
Merge "Logging user out after self password change" into stable/havana
Merge branch 'stable/havana' of https://github.com/openstack/horizon into stable/havana_routerrules