Make each Vagrant VM use a different SSH port forward

Add auto_correct: true to allow collisions to be nonfatal

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Merge pull request #165 from ceph/wip-sshport

Make each Vagrant VM use a different SSH port forward (to avoid collisio...

Reviewed-by: John Spray <john.spray@inktank.com>