In launch-node, we run two playbooks that aren't part of base.
One sets the system's hostname and removes cloud-init, the other
runs unattended update.
We need to run the hostname setting in our functional tests so
that the hosts behave as expected, but running the cloud-init
removal is a little weird, since our test nodes already don't
have it.
Make it so that set-hostname actually just sets the hostname,
and then run it in run-base. For running puppet, we need the
host to have the correct hostname.
Move cloud-init removal to the base-server role. Also move
the autoremove into base-server, since it's probably a nice
way to get rid of excess things.
Change-Id: I53cb8c515444a7d73b839e799c5794b067429daa
68b50ca05b