* Update all relations to be more specific, this helps
with --dry-run
* Update constraints, so that its balanced across the 3 systems
* Update overlay to fix versions
* ensure pause_minority for rabbitmq
* Add lxd metadata url
* Update constraints to make sure that units go to the right machine
* Fix source for mysql-router apps
* http for install_source for telegraf
* Update some snap lxd stuff to ensure that works
* Some bionic changes
