Set defaults for amqp in glance-registry.conf

We should set these defaults in glance-registry.conf
(they are actually the same as in glance-api.conf) to be able to
use oslo.messaging notification.api (in glance-registry)

Which is actually essential for osprofiler

Change-Id: I7768556aef17bb95123423f7e0cea54ecc21258b
Merge "Set defaults for amqp in glance-registry.conf"