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
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index b3aca42..371ff97 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -647,6 +647,10 @@
 # Is the v1 image API enabled (boolean value)
 #api_v1 = true
 
+# Is the deactivate-image feature enabled. The feature has been
+# integrated since Kilo. (boolean value)
+#deactivate_image = false
+
 
 [input-scenario]