python-dateutil will be updated to version 2.x and there may be changes that affect this package. If buildbot will work with the newer python-dateutil, you can safely close this bug. If buildbot really does require python-dateutil 1.5, please use Requires: python-dateutil15 for Fedora versions of the package until it can be updated.
Got confirmation from upstream that buildbot is compatible with the 2.x series