Merge pull request #154 from aplanas/master

Some refactors pending to be integrated in osc check repo
let the source checker verify if the source changed

if it only changed slightly we don't bother the review team
(for now review assigned to coolo for debug purpose, but that won't
stay this way for long :)
Merge pull request #155 from openSUSE/coolo_skip_small_changes

let the source checker verify if the source changed
Move change_review_state.
Move pending_requests and get_request.
action #2460 - Fix OBS mockup to behave as OBS when wrong URL