Remove neutron-dynamic-routing legacy jobs

The jobs have been moved into the repo with [0].

[0] I8d81fe6fb7e5e8f47fcac99120f54381219af2b9

Change-Id: I011a6ad3f913c0054ac854409c3515672875628f
Needed-by: I9962fd5aa9a13f315208255e2cc5f599871a6f53

zuul.d/projects.yaml

@@ -10616,28 +10616,11 @@
       - release-notes-jobs
       - periodic-jobs-with-neutron-lib-master
       - publish-to-pypi-neutron
-    check:
-      jobs:
-        - legacy-neutron-dynamic-routing-dsvm-functional
-        - legacy-neutron-dynamic-routing-dsvm-tempest-api
-        - legacy-neutron-dynamic-routing-dsvm-tempest-scenario-ipv4:
-            voting: false
-        - legacy-neutron-dynamic-routing-dsvm-tempest-scenario-ipv6:
-            voting: false
-        - legacy-neutron-dynamic-routing-dsvm-tempest-scenario-basic:
-            voting: false
-    gate:
-      jobs:
-        - legacy-neutron-dynamic-routing-dsvm-functional
-        - legacy-neutron-dynamic-routing-dsvm-tempest-api
     post:
       jobs:
         - openstack-tox-cover:
             required-projects:
               - openstack/neutron
-    experimental:
-      jobs:
-        - legacy-neutron-dynamic-routing-dsvm-tempest-with-ryu-master-scenario-ipv4
     periodic:
       jobs:
         - legacy-periodic-neutron-dynamic-routing-dsvm-tempest-with-ryu-master-scenario-ipv4