Log ip Information on ssh failures in the minimum scenario

The minimum scenario frequently have ssh connectivity issues,
 both with neutron and nova-network. Logging the ip and iptables
state at the failure, can help in finding the root cause sooner.

Change-Id: I3205541f96810b5b88e7c5ac3000fe1a1294ec65
Merge "Log ip Information on ssh failures in the minimum scenario"