webadmin: Disable destroy on Storage Domain when active

When a Storage Domain is in active status the destory action should be
greyed out otherwise a destory command is sent to the backend only to
fail the canDo for the Storage being in active status

Change-Id: Ie5259575fa71cbad74ca93c7be979ed607cf258d
Signed-off-by: Tal Nisan <tnisan@redhat.com>