zuul: remove legacy-tempest-dsvm-neutron-dvr-multinode-full

The job was part of the neutron experimental queue but then removed
during the ussuri lifecycle.
See https://review.opendev.org/#/c/693630/

Change-Id: I04717b95dd44ae89f24bd74525d1c9607e3bc0fc

Author: tosky

.zuul.yaml

@@ -422,8 +422,6 @@
             irrelevant-files: *dsvm-irrelevant-files
         - nova-tempest-v2-api:
             irrelevant-files: *dsvm-irrelevant-files
-        - legacy-tempest-dsvm-neutron-dvr-multinode-full:
-            irrelevant-files: *dsvm-irrelevant-files
         - neutron-tempest-dvr-ha-multinode-full:
             irrelevant-files: *dsvm-irrelevant-files
         - neutron-tempest-iptables_hybrid: