Stop updating volume snapshot status on every reconcile
Stop updating volume snapshot status on every reconcile

Ensure that the snapshot controller only updates the VM status when
something changed.

Without this comparision, the snapshot controller is performing a REST
operation after every trigger. This leads to the following behaviour:

 * Every VM modification leads to a rest call by the snapshot
   controller.
 * On ther periodic 5-minute reconcile by this controller a REST call is
   performed too.

Signed-off-by: Roman Mohr <6da0130c5aeef94e5bbaabadbf8017270be25c64@google.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt