Restructure the module so it connects to the remote data sink

Restructure the module so it connects to the remote data sink
on connect, and closes the socket on client disconnect. This should
make it much more efficient. Store the remote fd in a private data
pointer off the handle. Finally we need to remove the fstrings and
convert to allocated buffer storage.
Jeremy.
(cherry picked from commit 2f7884babcefcb04d1f9a877dde41e11b0f7b825)
(cherry picked from commit 1bf75ac9781c60be5a7b5899bc42aa1d198091d9)