In Iaas.wait_for_sshd, try to determine when client has no ipv6
connectivity, because otherwise we might wait a full 5 minutes without
any hope of success
Coverage decreased (-0.05%) to 90.42% when pulling 3e8b8b8f819a07d8938430e0fc8b7529a9fae8ec on romuald:no-ipv6 into 0b3bc1b050d46980787cfceb239d81a55957d21b on Gandi:master.
In Iaas.wait_for_sshd, try to determine when client has no ipv6 connectivity, because otherwise we might wait a full 5 minutes without any hope of success
Related to issue #229