Add cross-project tests for Telemetry

This change introduces cross-project tests for telemetry services(Aodh
and Ceilometer), so that we can detect any issue caused by change in
u-c file earlier.

Change-Id: I9830e9c8339c19e1bd4a6b878f8839f0a2e88e5a

.zuul.d/cross-jobs.yaml

@@ -44,6 +44,14 @@
       - upper-constraints.txt
       - .zuul.d/cross-jobs.yaml
 
+- job:
+    name: cross-aodh-py38
+    parent: requirements-cross-test
+    description: Run cross-project tests on aodh with py38.
+    required-projects: openstack/aodh
+    vars:
+      tox_envlist: py38
+
 - job:
     name: cross-barbican-py38
     parent: requirements-cross-test
@@ -52,6 +60,14 @@
     vars:
       tox_envlist: py38
 
+- job:
+    name: cross-ceilometer-py38
+    parent: requirements-cross-test
+    description: Run cross-project tests on ceilometer with py38.
+    required-projects: openstack/ceilometer
+    vars:
+      tox_envlist: py38
+
 - job:
     name: cross-cinder-py38
     parent: requirements-cross-test

.zuul.d/project.yaml

@@ -29,7 +29,9 @@
         - requirements-tox-py38-check-uc
         - requirements-tox-validate-projects:
             voting: false
+        - cross-aodh-py38
         - cross-barbican-py38
+        - cross-ceilometer-py38
         - cross-cinder-py38
         - cross-designate-py38
         - cross-glance-py38