Allow time for ipv6 auto addresses to get assigned

IPv6 SLAAC address assignment occurs asynchronously by the underlying
protocol and may not be complete even though the guest is up. Poll
(using ssh over IPv4) for the SLAAC assignment to complete.

Closes-bug: #1426397

Change-Id: I55db97b9fe8cedee3b939be536f1c62832d3f1de
1 file changed