Run apt-get autoremove after rm cloud-init

We remove cloud-init but we don't remove the stuff it sucks in.
Run autoremove to take care of that.

Change-Id: I6530d7444197ec763d3695020200c411aed545b4

playbooks/roles/set-hostname/tasks/main.yml

@@ -4,6 +4,9 @@
     name: cloud-init
     state: absent
 
+- name: Get rid of cloud-init depends
+  command: apt-get autoremove -y
+
 # Set hostname and /etc/hosts
 # Inspired by:
 # https://github.com/ansible/ansible/pull/8482)