horizon ignores region for identity service

this change will attempt to use a identity service in the selected region
when available.  before the region for the identity service was always the first
found

Change-Id: Idc64a32128bcee561cdbba956722adad0ee1eaf2
Closes-Bug: #1339382
Aggregates metadata cleanup

Adapt review comments on https://review.openstack.org/#/c/112874/
to admin/aggregates/views.py.

Closes-Bug: #1369677

Co-Authored-By: Bartosz Fic <bartosz.fic@intel.com>
Co-Authored-By: Pawel Skowron <pawel.skowron@intel.com>

Change-Id: If75e9e55811fe7cc092080827e69b9ebcd9c9bca
Sahara small UI fixes

Change-Id: I22486b5697ff9f6ffeae0b93e5564f254f732987
Closes-Bug: #1371370
Merge "Aggregates metadata cleanup"
Merge "horizon ignores region for identity service"
Merge "Sahara small UI fixes"