Remove old client driver
Name Escalator process in Circus
Always bind the sockets to localhost only

We were using 'tcp://*' to bind the socket, which is
bad because it binds the socket to every interface.
We only need localhost, any other interface could be
considered as a security hazard.
Skip DNS resolution when connecting sockets

We were using 'localhost' instead of '127.0.0.1' in order
to connect the sockets. This was triggering a DNS,
which could take some time.
This might explain the hangs we were seing during the
calls to 'connect' (cf #7).
Fix cleanup at exit in Escalator. Remove socket.