Description of problem:
In the install guide section 3.2.1 we use ansible all -m ping utility to validate that ansible can talk to all hosts but we dont specify it should be run from the configured ansible user. This can lead to issues if Ansible user isn't running the command as password-less SSH was configured for the Ansible user.

 Ensure that Ansible can reach the Ceph hosts:

# ansible all -m ping

We could say:

 Ensure that Ansible can reach the Ceph hosts by issuing the following from the previously  created Ansible user:

# ansible all -m ping

Version-Release number of selected component (if applicable):
RHCS 2.2