add timeouts to connections, reading & writing sockets etc

[komuw]

check vumi timeouts and use those; https://buildmedia.readthedocs.org/media/pdf/vumi/latest/vumi.pdf

[komuw]

• also add timeouts to all the calls to user BYO stuff like; brokers, hooks etc

[komuw]

the client.writer and client.reader should not have timeouts since they are non-blocking sockets.

print(self.writer.transport.get_extra_info('socket').gettimeout())
0.0

From [1]; If zero is given, the socket is put in non-blocking mode.

1. https://docs.python.org/3.6/library/socket.html#socket.socket.settimeout

[komuw]

also add timeouts to all the calls to user BYO stuff like; brokers, hooks etc

opened a new issue for this in #119