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 #47 from dpaterson/pull-req-release-pebbles-master-ed09f164923da2b84c21cf7f6e9a26ff02d6f14b

https://github.com/crowbar/barclamp-tempest/pull/47

Merged by devtool for ArkadyKanevsky
Merge pull request #48 from jtwill98/pull-req-release-roxy-master-17620546f850dd64dddb20c9c812824cc5589804

Merge of Latest Pebble commits into Roxy [3/13]