Added simple processor to generate csv report using two different tempest xml result files as input and showing delta in output.
Backport from mesa-1.6.1
Merge pull request #10 from dpaterson/pull-req-release-pebbles-master-ed09f164923da2b84c21cf7f6e9a26ff02d6f14b

Pull req release pebbles master ed09f164923da2b84c21cf7f6e9a26ff02d6f14b