* Change how data is sent to the persistent connection socket.
We can't rely on readline(), so send the size of the data first. We can
then read that many bytes from the stream on the recieving end.
* Set pty to noncanonical mode before sending
* Now that we send data length, we don't need a sentinel anymore
* Copy socket changes to persistent, too
* Use os.write instead of fdopen()ing and using that.
* Follow pickle with sha1sum of pickle
* Swap order of vars and init being passed to ansible-connection
f221105882