heat tests : WatchRule test add missing VerifyAll

We don't verify the mocked methods currently, so add the
missing VerifyAll and fixup the stubs

Change-Id: Ia74e64ef07d7b4fef6e060df1b794dc82cf7ee96
Signed-off-by: Steven Hardy <shardy@redhat.com>
Merge "heat tests : WatchRule test add missing VerifyAll"