KNIFE-204 support for ssh gateway on windows ssh bootstrap
switching to use of locate config
Per the discussion in https://github.com/opscode/knife-windows/pull/54
and based on additional testing, the
`Net::SSH::Service::Forward::UNIXServer = nil` doesn't seem to be needed
Merge pull request #62 from opscode/adamed-knife-204

KNIFE-204: Add Support for ssh_gateway in knife-windows