mwprof: change collector port to 3811

tungsten receives profiling data on port 3811. A small python script listens on
that port and multiplexes the data stream to localhost:3812 and professor:3811.
Now that professor has been decommissioned, the Python script is no longer
needed, and mwprof can bind to 3811.

Change-Id: I192160be50e40ea7db0012ea2b967882ec7418b6