Description of problem:
-------------------------
Unable to remove MDS by using shrink-mds.yml using fqdn,

Tried 3 different commands but none seems to work
# ansible-playbook -e ireallymeanit=yes infrastructure-playbooks/shrink-mds.yml -i hosts -vv -e mds_to_kill=dell-r640-013

# ansible-playbook -e ireallymeanit=yes infrastructure-playbooks/shrink-mds.yml -i hosts -vv -e mds_to_kill=dell-r640-013.dsal.lab.eng.rdu2.redhat.com

ansible-playbook  -e ireallymeanit=yes infrastructure-playbooks/shrink-mds.yml -i hosts -vv -e mds_to_kill=ceph-mds-dell-r640-013

Errors pasted http://pastebin.test.redhat.com/894482


Version-Release number of selected component (if applicable):
[root@dell-r640-012 /]# ceph version
ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)
[root@dell-r640-012 /]# ceph versions
{
    "mon": {
        "ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)": 2
    },
    "mgr": {
        "ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)": 1
    },
    "osd": {
        "ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)": 2
    },
    "mds": {
        "ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)": 1
    },
    "overall": {
        "ceph version 14.2.8-89.el8cp (9ab115d618c72e7d9227441ec25ceb1487c76fb8) nautilus (stable)": 6
    }
}

How reproducible:
Many times


Steps to Reproduce:
1. Try to shrink-mds using shrink-mds.yml playbook
2. the hosts file contained fqdn
3. Check if the mds is removed

Actual results:
The MDS did not get removed


Expected results:
The mds should have been removed from the cluster

Workaround:
------------
Instead of not having FQDNs as the hostname, try having something like this in hosts file 

#dell-r640-013.dsal.lab.eng.rdu2.redhat.com monitor_interface=em1
dell-r640-013 monitor_interface=em1

and run

ansible-playbook  -e ireallymeanit=yes infrastructure-playbooks/shrink-mds.yml -i hosts -vv -e mds_to_kill=dell-r640-013

The removal of MDS should be a success

Additional info: