The default LocalBuildConfiguration builds against Fedora - which has
ALLOW_ONLY_COMPATIBLE_BASE_MODULES = False on the server side. Match that
to avoid warnings that f33 isn't in <stream>x.y.z form.
config.allow_compatible_base_modules=False does different things for
build-requires selection and for module reuse. Clarify this in the config
key documentation.
(This config key is really: True: "do what RHEL expects"
False: "do what Fedora expects")
No implementations of MBS are using Greenwave, and there are no current plans
to do so. Koji Resolver will be sufficient for any usecase dependent on gating.
This also includes `from __future__ import absolute_import`
in every file so that the imports are consistent in Python 2 and 3.
The Python 2 tests fail without this.
