Add XML-RPC driver to Shotgun

Introducing an XML-RPC driver is allows us to collect some information
by XML-RPC call. In Fuel, we need it to get information from Cobbler,
since we can't call cobbler inside MCollective container.

Change-Id: Id64c80f0d6f9cb513771f7488f700408a837fb91
Closes-Bug: #1314071
Merge "Add XML-RPC driver to Shotgun"