Add support for Keystone V3 Auth in Horizon.

Set the minimum version of openstack_auth to 1.1.1 to run Horizon with
Keystone V3 Auth. Version 1.1.0 has a critical bug and needs to be
bumped to newer release.

Change-Id: I4c7cbe41bbb24a27d955a0af16de9d49bfc1e4c0
Implements: blueprint login-domain-support
Merge "Add support for Keystone V3 Auth in Horizon."