Instead of asking people to write unit tests let's just make
coverage job voting.
This can be implemented in very simple maner:
1) checkout to master
2) run coverage and get base line
3) checkout back
4) run coverage to get current coverage
5) If coverage was reduced more then 0.01% mark job as failed
Change-Id: Ib6bc4dbb11c69b107e6fcd6464a4041337ea1a66
These methods are tested in oslo-incubator not in rally,
so we should just ignore test covarage of them.
Change-Id: I8fb6a4be1968653ef982f60c896dcc6a2bf65625