Add cross-octavia-py3[6-7] jobs

The Train series saw a major version bump of jsonschema during
requirements freeze week[1] break octavia. This patch adds octavia
to the requirements cross-jobs list to help prevent this from
occuring in the future.

[1] https://review.opendev.org/#/c/649789/

Change-Id: I58b6b09b7cfe17ea2ba2ca436e679527ca7c6bb4

.zuul.d/cross-jobs.yaml

@@ -164,6 +164,23 @@
       tox_envlist: py37
       python_version: 3.7
 
+- job:
+    name: cross-octavia-py36
+    parent: requirements-cross-test
+    description: Run cross-project tests on octavia with py36.
+    required-projects: openstack/octavia
+    vars:
+      tox_envlist: py36
+
+- job:
+    name: cross-octavia-py37
+    parent: requirements-cross-test
+    description: Run cross-project tests on octavia with py37.
+    required-projects: openstack/octavia
+    vars:
+      tox_envlist: py37
+      python_version: 3.7
+
 - job:
     name: cross-swift-py27
     parent: requirements-cross-test

.zuul.d/project.yaml

@@ -40,6 +40,8 @@
         - cross-nova-py36
         - cross-nova-py37
         - cross-nova-functional
+        - cross-octavia-py36
+        - cross-octavia-py37
         - cross-osc-tox-docs
         - cross-swift-py27
         - cross-swift-py36
@@ -92,6 +94,8 @@
         - cross-nova-py37:
             files: ^upper-constraints.txt$
         - cross-nova-functional
+        - cross-octavia-py36
+        - cross-octavia-py37
         - cross-osc-tox-docs
         - cross-swift-py27
         - cross-swift-py36