test: Remove use of locking files for resources
test: Remove use of locking files for resources

If for some reason these were still in place before, the cause
was difficult to detect. Virtual machines (libvirt domains) with
a static ip address now also have a static domain name,
ensuring that a sane error message is displayed if the domain
can't be created, since libvirt assumes the name to be unique.

Closes #2963
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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