As I set check-compose up to wait for the compose and the openQA
jobs independently, we don't need to glue them together with
run-nightly.sh any more. So change the nightly service and timers
to run fedora-openqa-schedule directly. Now they're not using
a secret sauce script, we can document them properly.
TODO: implement a config file for wait time (and log level) so
we don't have to put it in here as a hardcoded argument.
This is on top of D551.