Start conversion to Python 3
Usage comments
Fix wrong exception catching
Usage comments for NameBroker
Set own module exception for empty queue
Check there is route to target
Move send_to_namebroker to client object
Wait for reader thread to finish on close
Converting test to new py.test style
Add test module for pipes
Ignore backup files
Low level fields are "dunder"
Read from socket inside the try/except

So if socket is already closed, exception is ignored.
Test address message of pipe
Test low level ping and any other data
Remove dead code
Refactor into separate modules
Add unregister command to namebroker client
Use the name broker client api
Fix missing modules and objects