Comment 4 for bug 1831918

Straight forward for create, add notifications import, change signature to include initiator=None and add the notification code as listed.

There is no delete method because it automagically calls the delete in the driver (keystone/credentials/backends/sql.py), best to add the delete function to the manager in core.py so the notification can happen from there

But then do I have to make sure the delete function in the manager is actually called? We're starting to get past my understanding of how things work.