This tests to make sure that the metadata timer is working (by setting
it to 10s and adding a new package to the repo), and that
DNFLock.lock_check immediately picks up a new package.
This depends on rpmfluff which is available from Fedora or EPEL repos.
Related: rhbz#1631561
these are built on top of beakerlib and we use its internal
protocol to figure out the result without relying on the full
test runner that is tipically used inside of a RHEL environment!
Includes a disabled test snippet for Issue #460
