Add post_upgrade_task and remove puppet-ceph pkg

Adds a post_upgrade_task to remove the puppet-ceph package which
is no longer required.

Also see change I9cd63ee34dfd964f18a33043980703660b0a55d7 for
the ceph-ansible version.

Change-Id: I74874b81002fe435752a5cd724d2df9683b0cdbf

deployment/cephadm/ceph-base.yaml

@@ -594,3 +594,10 @@ outputs:
                 name: tripleo_run_cephadm
               when: groups['ceph_mon'] | default([]) | length > 0 or
                     groups['ceph_nfs'] | default([]) | length > 0
+      post_upgrade_tasks:
+        - name: Clean puppet-ceph package
+          when:
+            - (step | int) == 3
+          package:
+            name: puppet-ceph
+            state: absent