Add support for image deactivate and reactivate

https://wiki.openstack.org/wiki/Glance-deactivate-image
Adding the api support for these commands.
Deactivate and reactivate image action is done by admin tenant.

- Added admin folder to image tests
- Added support for admin image classes for v1 and v2
- Added config deactivate_image , this feature is not running on
  icehouse
- Added a testcase for image deactivate.

Depends-On: Ia1d3d811bd57d3de16d397cfab341e8d0f17cb69
Change-Id: I7880f0e2646ce8660e035ebaa19a60f5bf271b64
7 files changed