generic: bugfix: CheckUpdateDesktopDatabase: look in %post/%postun.

Previous code looked in %install, plain wrong.
try-fedora-review: exit with proper exitcode.
generic: scripts: Improve some messages
generic_should: CheckDistTag: Many bugfixes.

Previous code had wrong url, failed for tags which did not end with
the disttag, could not handle multiple Release: tags and pretended
that the disttag is mandatory.
php: bugfix: remove the only test, it's outdated.
check-large-data: make ouput more meaningful.

Only report total size of unarched data in arched rpms + individual
rpms which exceeds the limit. Clean up the output.