Changed docker-machine and sshutil to support hostnames with colons in them, for example ipv6 addresses
Changed docker-machine and sshutil to support hostnames with colons in them, for example ipv6 addresses

jimmidyson/minishift,jimmidyson/minishift,LalatenduMohanty/minishift,praveenkumar/minishift,jimmidyson/minishift,praveenkumar/minishift,budhrg/minishift,LalatenduMohanty/minishift,budhrg/minishift,minishift/minishift,Preeticp/minishift,budhrg/minishift,thatdocslady/minishift,thatdocslady/minishift,Preeticp/minishift,praveenkumar/minishift,LalatenduMohanty/minishift,thatdocslady/minishift,minishift/minishift,minishift/minishift,Preeticp/minishift