SVN source steps mode=export support authentication. Fixes #2463
PyFlakes: fix handling of syntax error
Merge branch 'master' of git://github.com/kviktor/buildbot
Master side source checkout steps support retry option. Fixes #2465, #2357
Merge branch 'bug2463' of git://github.com/srinupiits/buildbot
Merge branch 'bug2465-sqash' of git://github.com/srinupiits/buildbot