QA » openQA Project

The backend of a worker is currently hardcoded to qemu.
Also some workers need specific configuration - eg. kvm2usb workers
need the HWSLOT variable set - and each worker needs it's own value.

Therefore I will add a configuration file in /etc/openqa which
will define the BACKEND variable as well as other vars for each
worker id.

To prevent breaking existing setups, the file will only be read in, if it
exists and if there is no config for a worker, the BACKEND will default
to qemu.