Move the container directory, containing the container definitions
for all the test containers, to test/, where all the other test-
related files are located (with the exception of `Schutzbot`).
Use `test/build-container.sh` to build the container, instead of
replicating that in `test-integration.sh`.
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.
