Remove legacy tripleo-ci-dsvm* jobs

Jobs are no longer used anywhere and can be removed. This also
makes zuul syntax check for job inheritance much lighter as its
legacy parent job, legacy-dsvm-base, loads a bunch of config from
several projects.

Change-Id: I3518d78e3c56923a051c6554c88be27f54c05bd0

zuul.d/base.yaml

@@ -149,43 +149,3 @@
       tags:
         - build
         - standalone
-
-- job:
-    name: tripleo-ci-dsvm
-    description: |
-      Base job template for TripleO jobs that leverage devstack-gate/dsvm
-    parent: legacy-dsvm-base
-    pre-run: playbooks/nodepool-provider/pre.yaml
-    vars:
-      # Note (dmsimard): This enforces a minimum TTL for DNS records, see
-      # https://review.openstack.org/#/c/523178/ for context
-      unbound_cache_min_ttl: 900
-    required-projects:
-      - git.openstack.org/openstack-infra/devstack-gate
-      - git.openstack.org/openstack-infra/tripleo-ci
-      - git.openstack.org/openstack/tripleo-quickstart
-      - git.openstack.org/openstack/tripleo-quickstart-extras
-      - git.openstack.org/openstack/tripleo-upgrade
-    irrelevant-files:
-      - ^.*\.md$
-      - ^.*\.rst$
-      - ^doc/.*$
-      - ^etc/.*$
-      - ^metadata.json$
-      - ^releasenotes/.*$
-      - ^requirements.txt$
-      - ^test-requirements.txt$
-      - ^spec/.*$
-      - ^Puppetfile.*$
-      - tox.ini
-      - ^setup.*$
-
-- job:
-    name: tripleo-ci-dsvm-multinode
-    description: |
-      Base legacy job for multinode tripleo jobs.
-      Ensures the firewall allows all traffic between test nodes.
-    parent: tripleo-ci-dsvm
-    roles:
-      - zuul: openstack-infra/zuul-jobs
-    pre-run: playbooks/multinode-networking/pre.yaml