buildbot/buildbot — pull request #1242 by delanne (2014-10-01 13:19:05+00:00)
Title: PR for trac #2621 and trac #2658

- use builderid as a foreign key instead of using buildername for the table buildrequests
- addbuilset take a list of buildersID
- check signatures for the BaseScheduler?'s addBuildsetForXxx methods
- remove buildername as a data field for buildrequests.