Adding XML format to Criteria export tuning I/F

BZ: 209937

The "listCriteria" command returns the list of criteria in a human readable
way. However, external tools that require to know this list of criteria have
trouble parsing this output. An XML output would solve the issue.

Changed "listCriteria" command to accept "XML" as first and only argument.
In the end, listCriteria command accepts the 3 following forms:
- listCriteria => will list the criteria states and type content in a human
readable format
- listCriteria csv|CSV => will list the criteria states and type content in a
CSV format
- listCriteria xml|XML => will list the criteria states and type content in an
XML format

Removed python binding accordingly.

Change-Id: Ib060ec0a5d1ff87ba6c25caf4e0d5839a7927715
Signed-off-by: Patrick Benavoli <patrick.benavoli@intel.com>
Signed-off-by: Sebastien Gonzalve <sebastien.gonzalve@intel.com>