Introduce Debian OS support, various fixes

* Fix designate package name require, openstack-designate is the final
  package name, designate-common name is override by params class.
* Remove designate-common dependency on central/sink/api services.
* Fix designate::api/keystone_user default user.

Change-Id: I441565d39ba5d425c6b93db071237a85f1eb4b1f