Add dump of request URI and parameters to client in debug mode

[ericvaandering]

Motivation

CMS has a couple of applications which directly use the REST interface to interact with Rucio. It's always a challenge to turn command line or python client code into the equivalent REST interface calls.

Modification

This modification would either use an existing debug parameter to dump out the method (GET/POST/etc), the URI, and any parameters passed to the Rucio server when executing a Rucio command so that the REST parameters can easily be inferred.