App servers always reference local db connection

[lbragstad]

I'm not sure if this is a bug or undocumented feature, but I've found that when I have an inventory file similar to the following:

[db]
192.168.111.220

[app]
192.168.111.222

The application server doesn't seem to connect to the designated database host. I think this is because the keystone.conf template always assumes that the Keystone server includes a local database [1]. I'm curious if it would be possible to build in the following:

[db]
192.168.111.220

[app]
192.168.111.221
192.168.111.222

Where we could configure multiple Keystone servers to point to the same database.

I'd like to take a stab at adding the support for this.

[1] https://github.com/dolph/keystone-deploy/blob/master/playbooks/roles/http/templates/keystone.conf#L29