Add non-voting nova-lxd functional test

This patch implements a replacement of the legacy
functional test previously implemented using
openstack-ansible. The job and pipeline is defined
in-repo to ensure that the nova-lxd team has complete
control over the voting status, pipelines it is in,
etc.

The test uses the 'func_lxd' tox environment in the
openstack/openstack-ansible-os_nova repository which
executes an integration build of nova services in a
container, using the nova-lxd compute driver, using
linuxbridge for networking and using the nodepool host
for compute.

Depends-On: If39e4bec8db0be04b13dfc005ee404b73c0b65d3
Depends-On: Ia5ab6aa43f912b3cb4adf98154cd3da12688c2e0
Depends-On: I4995fcac48889bd189cc1f25adb442b7a6637a46
Change-Id: I49075be82daf62b1ca564c77bf835ae83cd6595b

.zuul.yaml

@@ -0,0 +1,30 @@
+---
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This job will execute 'tox -e func_lxd' from the OSA
+# repo specified in 'osa_test_repo'.
+- job:
+    name: openstack-ansible-nova-lxd
+    parent: openstack-ansible-cross-repo-functional
+    voting: false
+    required-projects:
+      - name: openstack/openstack-ansible-os_nova
+    vars:
+      tox_env: func_lxd
+      osa_test_repo: "openstack/openstack-ansible-os_nova"
+
+- project:
+    name: openstack/nova-lxd
+    check:
+      jobs:
+        - openstack-ansible-nova-lxd