Add image re/deactivate commands

This change allows admins to deactivate and reactivate their
images. Currently this has to be done with the REST api or the
glanceclient.

This change introduces `--deactivate` and `--activate` for the `image
set` command.

This requires glanceclient 1.2.0. Which got bumped here:
https://review.openstack.org/#/c/257512/

Change-Id: I476c44a0343cdc92d58ddc93fb06470242de2345
Depends-On: I2c370c6bf6ff664d94d756cc76aaa983fbdb8869
Closes-Bug: 1516661

doc/source/command-objects/image.rst

@@ -243,6 +243,7 @@ Set image properties
         [--os-distro <os-distro>]
         [--os-version <os-version>]
         [--ramdisk-id <ramdisk-id>]
+        [--activate|--deactivate]
         <image>
 
 .. option:: --name <name>
@@ -387,6 +388,18 @@ Set image properties
 
     .. versionadded:: 2
 
+.. option:: --activate
+
+    Activate the image.
+
+    .. versionadded:: 2
+
+.. option:: --deactivate
+
+    Deactivate the image.
+
+    .. versionadded:: 2
+
 .. describe:: <image>
 
     Image to modify (name or ID)