.Zuul.yaml update for Neutron Classifier

This patch updates the neutron classifier zuul yaml file.
Part of neutron-sibling setup. [1] Changes based on x/vmware-nsx
project. [2]
Changes include:
- Removes dsvm from functional job.
- Removes devstack and devstack-gate from required-projects.
- Adds glance, placement and nova to required projects
- Makes neutron-classifier-functional-dsvm non-voting.
- Changes the openstack-python3-train-jobs to project template
with neutron.
- Moves the tox_install_siblings to under "vars:" in .zuul.yaml

[1] https://etherpad.openstack.org/p/neutron-sibling-setup
[2] https://review.opendev.org/#/c/670134/

Change-Id: I031d7bef6587f0392a0416c0a29dc8caf72e98bd
Co-Authored-By: Boden R <bodenv@gmail.com>

.zuul.yaml

@@ -3,20 +3,16 @@
       - build-openstack-docs-pti
       - check-requirements
       - openstack-python-jobs
-      - openstack-python3-train-jobs
+      - openstack-python3-train-jobs-neutron
     check:
       jobs:
         - neutron-classifier-tox-lower-constraints
-        - neutron-classifier-functional-dsvm:
-            required-projects:
-              - openstack/neutron
+        - neutron-classifier-functional:
+            voting: false
     gate:
       queue: neutron-classifier
       jobs:
         - neutron-classifier-tox-lower-constraints
-        - neutron-classifier-functional-dsvm:
-            required-projects:
-              - openstack/neutron
 
 - job:
     name: neutron-classifier-tox-lower-constraints
@@ -25,30 +21,19 @@
       - openstack/neutron
 
 - job:
-    name: neutron-classifier-functional-dsvm
-    parent: legacy-dsvm-base
-    run: playbooks/legacy/neutron-classifier-functional-dsvm/run.yaml
-    post-run: playbooks/legacy/neutron-classifier-functional-dsvm/post.yaml
+    name: neutron-classifier-functional
+    parent: neutron-functional
     timeout: 7800
     required-projects:
-      - openstack/devstack-gate
       - openstack/keystone
       - openstack/neutron
-    roles:
-      - zuul: openstack/devstack-gate
+      - openstack/glance
+      - openstack/nova
+      - openstack/placement
+      - openstack/python-openstackclient
     vars:
+      tox_install_siblings: true
       devstack_localrc:
-        DATABASE_PASSWORD: secretdatabase
-        RABBIT_PASSWORD: secretrabbit
-        ADMIN_PASSWORD: secretadmin
-        SERVICE_PASSWORD: secretservice
-        NETWORK_GATEWAY: 10.1.0.1
-        FIXED_RANGE: 10.1.0.0/20
-        IPV4_ADDRS_SAFE_TO_USE: 10.1.0.0/20
-        FLOATING_RANGE: 172.24.5.0/24
-        PUBLIC_NETWORK_GATEWAY: 172.24.5.1
-        LOGFILE: /opt/stack/logs/devstacklog.txt
-        LIBVIRT_TYPE: qemu
         LIBS_FROM_GIT: python-openstackclient
         GLANCE_V1_ENABLED: true
       devstack_services: