Addition of XML support to test_console_output.py

Added logic to test_console_output.py file so as to support XML calls.
Hence added exclusive client file for XML. Also modified JSON client
file and openstack.py according to new addition of XML support.

Change-Id: Ib1fab3e3dc97d3b61ceb60e0d846c4b36f472932
Implements: blueprint add-xml-support
5 files changed