Add tag to skip ceph-ansible removal

Currently ceph-adopt playbook removes ceph-ansible package
at the end.
This patch will add a tag 'cleanup_cephansible' to the task
which can be used in --skip-tags to skip the removal.

Resolves: rhbz#2249690
Change-Id: Ic87f39920865c6d4e9eda8ca5c29388e412ce7c1

deployment/ceph-ansible/ceph-base.yaml

@@ -740,6 +740,7 @@ outputs:
             state: absent
           tags:
             - cephadm_adopt
+            - cleanup_cephansible
       external_update_tasks:
         - when: step|int == 0
           tags: ceph