Add project name to the project deleted notification event

So we had this argument in the past. Quite a few of those in fact, about conveying names in generate, in the notification message payload. As I recall, the counter arguments were

1. names are mutable, and
2. as resources are being deleted, new resources can take on the same name, and
3. the only thing we can guarantee that is globally unique is the resource ID.

I am a proponent of adding name to notification payload. Reasons are

1. a notification is really a snapshot of an event that happened in Keystone, and
2. they will be aggregated by Security Incident and Event Monitoring (SEIM), and
3. as indicated above, operational workflow is depending on it

So I say lets do this.

Fix proposed to branch: master
Review: https://review.openstack.org/320299

If we're going to make this change, we should *uniformly* include the names of all resources that have names (rather than treat projects as being special): domains, users, roles, groups, etc.

I attempted to capture some of the discussion we had on this topic at the summit in Austin [0].

[0] http://lbragstad.com/improving-auditing-in-keystone/

Change abandoned by Steve Martinelli (<email address hidden>) on branch: master
Review: https://review.openstack.org/320299
Reason: no change in 5 months, and lots of overlap with https://review.openstack.org/#/c/288643/, lets use that one instead