Description of problem:
    I have created a ceph cluster named "iscsi1". The task to sync the admin keyring fails, since its looking for the "ceph.client.admin.keyring".
the keyring should be "<cluster>.client.admin.keyring"

ll /etc/ceph/
total 12
-rw-------. 1 ceph ceph  63 Oct 19 01:57 iscsi1.client.admin.keyring
-rw-r--r--. 1 ceph ceph 803 Oct 19 01:57 iscsi1.conf
-rwxr-xr-x. 1 root root  92 Oct 12 12:40 rbdmap



TASK: [ceph-iscsi-gw | sync the admin keyring from the seed monitor to each gateway node] *** 
failed: [havoc -> harvard] => {"cmd": "rsync --delay-updates -F --compress --archive --rsh 'ssh  -S none -o StrictHostKeyChecking=no' --out-format='<<CHANGED>>%i %n%L' \"/etc/ceph/ceph.client.admin.keyring\" \"root@havoc:/etc/ceph/ceph.client.admin.keyring\"", "failed": true, "rc": 23}
msg: rsync: link_stat "/etc/ceph/ceph.client.admin.keyring" failed: No such file or directory (2)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1052) [sender=3.0.9]

failed: [mustang -> harvard] => {"cmd": "rsync --delay-updates -F --compress --archive --rsh 'ssh  -S none -o StrictHostKeyChecking=no' --out-format='<<CHANGED>>%i %n%L' \"/etc/ceph/ceph.client.admin.keyring\" \"root@mustang:/etc/ceph/ceph.client.admin.keyring\"", "failed": true, "rc": 23}
msg: rsync: link_stat "/etc/ceph/ceph.client.admin.keyring" failed: No such file or directory (2)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1052) [sender=3.0.9]

failed: [magna086.ceph.redhat.com -> harvard] => {"cmd": "rsync --delay-updates -F --compress --archive --rsh 'ssh  -S none -o StrictHostKeyChecking=no' --out-format='<<CHANGED>>%i %n%L' \"/etc/ceph/ceph.client.admin.keyring\" \"root@magna086.ceph.redhat.com:/etc/ceph/ceph.client.admin.keyring\"", "failed": true, "rc": 23}
msg: rsync: link_stat "/etc/ceph/ceph.client.admin.keyring" failed: No such file or directory (2)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1052) [sender=3.0.9]

failed: [magna080.ceph.redhat.com -> harvard] => {"cmd": "rsync --delay-updates -F --compress --archive --rsh 'ssh  -S none -o StrictHostKeyChecking=no' --out-format='<<CHANGED>>%i %n%L' \"/etc/ceph/ceph.client.admin.keyring\" \"root@magna080.ceph.redhat.com:/etc/ceph/ceph.client.admin.keyring\"", "failed": true, "rc": 23}
msg: rsync: link_stat "/etc/ceph/ceph.client.admin.keyring" failed: No such file or directory (2)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1052) [sender=3.0.9]


FATAL: all hosts have already failed -- aborting

We have a provision to support different names for clusters from Ceph 2.0 onwards.




Version-Release number of selected component (if applicable):
ceph-ansible-1.0.5-36.el7scon.noarch
ceph-iscsi-ansible-1.2-1.el7scon.noarch

How reproducible:
Always

Steps to Reproduce:
1. on a cluster which has a user defined name, try to create the iscsi gateways