* Add SSHCLIRemote type with buildSSHArgs
Implement's Executor interface (Run, Stream, Close)
* Add UseSSHCLI field to RemoteMachine struct
Allow us to differentiate regular ssh from ssh+cli.
* Parse ssh+cli:// scheme on machine init/add
* Support SSH CLI when provisioning
* Update docs to reflect ssh+cli:// support
* Revert removal of `init` examples
Fixes copy & pasta mistake when documenting the new ssh+cli connection
methods.