Remove webhook functional test
Remove webhook functional test

Webhook is now just a receiver type that supported by Senlin
service. So we just remove its functional test before completing
functional test of receiver.

Change-Id: I4e8847414885fecf5c18d7689558639dc8691336

openstack/senlin,openstack/senlin,tengqm/senlin-container,stackforge/senlin,stackforge/senlin,openstack/senlin,tengqm/senlin-container