* Support TLS for Swift endpoints
* Support hostname for Swift endpoints
* Allow user to enable Swift as Glance backend
* Allow user to disable upload_cirros task.
Change-Id: Icbd576268f37ba436cc14718fab1fd917162dd83
Closes-Bug: #1586451
Closes-Bug: #1586449
Closes-Bug: #1586445
Closes-Bug: #1586438
Closes-Bug: #1586442
Closes-Bug: #1586834
Closes-Bug: #1586471