group_vars: default to version 2 of RHCS
group_vars: default to version 2 of RHCS

This RHCS version is now generally available. Default to using it.

Signed-off-by: Alfredo Deza <adeza@redhat.com>
Signed-off-by: Ken Dreyer <kdreyer@redhat.com>

Related: rhbz#1357631

ceph/ansible-ceph-common