ssh-config

Add support for multipath SSH command:
 - Org property: :Other-Path: jh1
 - Result in ssh config:
   ProxyCommand sh -c "ssh -q -t PROXY nc -w 60 %h %p || ssh -q -t jh1 nc -w 60 %h %p"

If PROXY could not be joined, try to connect via jh1.