As was agreed on the CI meeting [1], this patch moves
neutron-ovn-grenade-multinode job from the experimental queue to the
check and gate queues.
Now in check/gate there are 2 grenade jobs: one ovs-multinode job and
one ovn-multinode job.
To not increase number of jobs in the check/gate, this patch also moves
neutron-ovs-grenade-dvr-multinode job to the periodic (and experimental)
queue.
[1] https://meetings.opendev.org/meetings/neutron_ci/2024/neutron_ci.2024-06-11-15.02.log.html#l-18
Change-Id: I22d0f9a59bca6f412dcf30005678229a859d5e4c
e1cf0f2d59