Change XmlFilteringTest to use new methods

Change-Id: Iec8fc8f655efc3e77003b8e0420dd2863ee65c1a
Reviewed-on: https://pirx.atteo.com/gerrit/573
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
Update README

Change-Id: I9bbd6a179e5aaf554458ea6e4b64526373f27b7e