Upstream composer has introduce a few changes that we need to
adapt for:
- the koji composer API is now exposed on the standard https
port (443). Thus koji hub and web need to move to a different
pair: 8080 (http) and 4343 (https). Change the scripts and
tests for that
- the koji API gained a prefix 'api/composer-koji/v1/'. Change
client and unit tests to use that prefix. Use urljoin to
create new APIs
- composer configuration format (osbuild-composer.toml) has
changed and now also includes configuration for the CA
and allowed domains
- update the composer RPM repositories to the commit for the
21 upstream release.
Add a separate unit test to do a compose for a RHEL based image,
but then restrict the execution of test_compose_{disto} to the
distribution the test is running on, since currently cross-
distribution builds can be problematic.
