webadmin: expose ACTION_TYPE_FAILED_DISK_IS_NOT_VM_DISK code in UI

Change-Id: I9dd47380594b27db7347e28fce27abcf11cf63ac
Bug-Url: https://bugzilla.redhat.com/1021420
Signed-off-by: Sergey Gotliv <sgotliv@redhat.com>