Make nova-cells-v1 run with neutron

This changes the nova-cells-v1 job to run with neutron instead
of nova-network.

SSH validation is already disabled in Tempest for this job.

Since the os-server-external-events API is not plumbed in for
cells v1, we have to disable vif plugging settings in
nova-cells.conf. This means servers will be ACTIVE before
networking is sure to be ready so we can't rely on ssh validation.

We also configure Tempest to say floating IPs aren't available
which skips several scenario tests that wouldn't work with cells v1
anyway due to them trying to ssh into the guest.

Part of blueprint remove-nova-network

Change-Id: I9de6b710baffdffcd1d7ab19897d5776ef27ae7e

playbooks/legacy/nova-cells-v1/run.yaml

@@ -23,6 +23,31 @@
         chdir: '{{ ansible_user_dir }}/workspace'
       environment: '{{ zuul | zuul_legacy_vars }}'
 
+    # NOTE(mriedem): vif_plugging_timeout depends on the
+    # os-server-external-events API which isn't plumbed in for cells v1
+    # so we have to disable vif_plugging_timeout. This means servers can
+    # go to ACTIVE status before networking is setup in the guest and we
+    # can't rely on ssh validation in testing. Some tempest tests might
+    # also fail in racy ways, so add them to tempest-dsvm-cells-rc if they
+    # do.
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat << 'EOF' >>"/tmp/dg-local.conf"
+          [[post-config|$NOVA_CELLS_CONF]]
+          [DEFAULT]
+          vif_plugging_timeout=0
+
+          [[test-config|$TEMPEST_CONFIG]]
+          [network-feature-enabled]
+          floating_ips=False
+
+          EOF
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
     - shell:
         cmd: |
           set -e
@@ -30,10 +55,9 @@
           export PYTHONUNBUFFERED=true
           export DEVSTACK_GATE_TEMPEST=1
           export DEVSTACK_GATE_CELLS=1
-          # NOTE(mriedem): Explicitly tell devstack-gate that we need to run
-          # the cells v1 job with nova-network.
-          export DEVSTACK_GATE_NEUTRON=0
 
+          # Note that tempest-dsvm-cells-rc sets TEMPEST_RUN_VALIDATION=False
+          # so we do not have to set it here.
           export DEVSTACK_GATE_SETTINGS=/opt/stack/new/nova/devstack/tempest-dsvm-cells-rc
 
           cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh