Stageless payloads need to have the socket FD left along (ie. 0)
otherwise each of them will think that the socket is already open.
Instead we need to make sure it's left as 0 as per the configuration and
from there the stageless code will fire up a new socket based on the
transport in question.
Methods now require a hash. I went with the hash because 1) that's what
we seem to use everywhere else, and 2) I couldn't get the new keyword
arguments working nicely with the block syntax (I'm clearly stupid).
OJ