Python logging by default sends all output to stderr, but that's not what
normal programs usually do and is not expected for these scripts.
Change the ubuntutools.getLogger() method to return a logger with handlers
correctly set up to send INFO level (or lower) logs to stdout and WARNING
level (or higher; technically INFO+1 level or higher) logs to stderr.
This results in normally logged output going to stdout and warnings/errors
going to stderr, as expected.
* PersonTeam.canUploadPackage() can now also check package sets for upload
permissions. This requires now to also pass the distroseries as package sets
are per distroseries.
* Drop PersonTeam.isPerPackageUploader() as it's also handled by canUploadPackage()
ubuntu-build: Update for the PersonTeam.canUploadChange().
ubuntutools/requestsync/{lp,mail}.py:
* needSponsorship() now also expects a release name because of the above mentioned
change to PersonTeam.canUploadPackage().
requestsync: Update for needSponsorship() change.
