mon: do not hardcode ipv4
mon: do not hardcode ipv4

Problem: fail to deploy a containerized Ceph cluster with ipv6
Solution: do not hardcode ipv4 when bootstrapping the container.

Now use ip_version: ipv6 to get a containerized cluster deployed with
ipv6.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1451786
Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

jtaleric/ceph-ansible,travmi/ceph-ansible,bengland2/ceph-ansible,font/ceph-ansible,jtaleric/ceph-ansible,fgal/ceph-ansible,font/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,bengland2/ceph-ansible,ceph/ceph-ansible,travmi/ceph-ansible