The multi-node-aio update that moved the provisioning from bash to
ansible dropped a few features that we use for gating purposes. This
commit re-adds the following:
1. The ability to drop iptables rules to do port redirection from the
host to private IPs. This is controlled by CONFIG_PREROUTING and
the ansible variable mnaio_host_iptables_prerouting_ports.
2. /etc/hosts on the physical node is now updated w/ the hostname and
IP of each VM so we can access VMs by name.
NOTE: With #1, we redirect to the VM's DHCP address, and not it's
management address. The latter seemed to the desired address
but didn't work, which is why we've resorted to DHCP. If using
this address is incorrect please note so we can investigate
further.
Change-Id: Ib194c314280f2474a2e4dac6d0feba44b1ee696f
28684e6c6e