Clean up cookbook for bp/clean-up-attr-for-mq-and-db

This change removes the attributes we'll be moving to openstack-common
and changes reference of those attributes to reflect new (more
consistent) namespace. We also fix a test which isn't converging after
having node attributes set. Lastly, we handle the rabbit mq attribute
use_ssl.

Change-Id: Ic9bfc769781c222b84d1e6e86df4306755c64e70
Implements: blueprint clean-up-attr-for-mq-and-db
Merge "Clean up cookbook for bp/clean-up-attr-for-mq-and-db"