engine: Copying a quota drops consumers and permissions

Add a option to copy consumers and permissions while cloning
a Quota.

A check box (copy consumers and permissions) added to clone quota
dialog.

Change-Id: Ide6f9ded5c19d16f7b4c7e373df9664e59fb1419
Bug-Url: https://bugzilla.redhat.com/908835
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>