u/fjammes/dm-1338

Reviewing DM-1338
Please note that QSERV_RPC_PORT doesn't seems to be check for now by proxy code (I've a wrong configuration for this parameter while developing and the proxy doesn't give me a clear error message). This may be the same for QSERV_UNIX_USER.
Shall we let this control in init.d script while they're not still implemented in the proxy code, this will ease debugging while developping?
Futhermore, this parameters should be in proxy configuration file in the future and should then disappear from init scripts, solving this problem.