add a playbook that removes manager from a node
add a playbook that removes manager from a node

Add a playbook, named "shrink-mgr.yml", in infrastructure-playbooks/
that removes a MGR from a node in an already deployed Ceph cluster.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1677431
Signed-off-by: Rishabh Dave <d65d05ccb4d95d4cd49c1a041af3276370381a83@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible