Add action_wait_secs for update
Add action_wait_secs for update

Add action_wait_secs for TestResource in api tests, so
that consecutive updates would have different updated_time.

Change-Id: I08d2ac6625acaa0828b18b5e805c81031bb87c01
Related-Bug: #1721692

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat