The messaging is not really part of compose settings. It is an
infrastructure part. As such, it should really be set up as part of
pungi invocation, not compose configuration.
The documentation is updated to reflect this. Some updates to the
documentation are done as well: listing messages about ISOs and minor
formatting updates.
The test_compose.sh script can now accept additional command line
options and pass them on to pungi-koji to simplify testing.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>