Extend the `api.sh` to allow testing compose requests with distro name
which does not use dot-notation (specifically when the dot is removed
from the distro name as it used to be in the past). In addition to that,
allow also testing the distro alias using distro name without the minor
version in compose requests.
Enable these two new test variants in the CI.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
