Currently CentOS-7 machines were requested. CentOS-8 has been out for a
while now, and is stable for running manual jobs. There is nothing
preventing us from using CentOS-8 bare-metal machines for testing.
Signed-off-by: Niels de Vos <ndevos@redhat.com>
To prevent the failure of job due to unavailability
of a machine immediately, retry mechanism is used.
If unable to reserve a machine, it will retry every
5 mins for 30 times to avoid job failure.
Signed-off-by: Yug Gupta <ygupta@redhat.com>