Unfortunately the only way we can know the user_id at this point is
by parsing the error message.
I also refactored the exceptions in openstack_auth to make them use
different classes (but one common superclass).
Partially implements blueprint: allow-users-change-expired-password
Change-Id: Ieceee09db21040b96577db19bd195dc3799e3892
Moves Django OpenStack Auth content to Horizon, since they are so
tightly coupled. This cleans up the development workflow and should
make keystone / auth related contributions easier.
Implements: blueprint merge-openstack-auth
Change-Id: Ia1cdc47bad1ca6e633073a9f9445b0c7f70d05bc