new preauth: handle connection first line of JSON
new pull_request: accept either path or port/host
new remote_transform: set remote on objects
vcexec: handle pull and push requests
vcexec: use new RemoteTransform to set _id._pe
vcexec: give tests time to setup signal handlers

see https://github.com/joyent/node/issues/8667#issuecomment-61566101
vcexec: send "listen" message when ready