systemd-252-16.el9 introduced a regression
where libvirtd process exits after 120s of
inactivity.
Add a workaround to unset 120s timeout for
libvirtd, the workaround can be removed once
the fix is available in systemd rpm.
Related-Bug: #2029335
Change-Id: Id6db6c17518b54d5fef7c381c509066a569aff6d