Description of problem:
While installing RGW node using ceph-ansible, admin keyring is not created in the RGW node.


Version-Release number of selected component (if applicable):
ceph-ansible-1.0.5-3.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Install a cluster along with RGW node using ceph-ansible
2. Run radosgw-admin command on RGW node after installation.

Actual results:

# radosgw-admin zone list
2016-04-25 13:23:28.341959 7ff4df27ea40 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory
2016-04-25 13:23:28.341985 7ff4df27ea40 -1 monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication
2016-04-25 13:23:28.341989 7ff4df27ea40  0 librados: client.admin initialization error (2) No such file or directory
couldn't init storage provider

ls /etc/ceph
ceph.conf  rbdmap


Expected results:

ceph.client.admin.keyring should be present in /etc/ceph