Do not install libvirt-python on RHEL via pip

since that is already in place.

Closes-Bug: #1896327
Depends-on: https://review.opendev.org/c/openstack/telemetry-tempest-plugin/+/801038

Change-Id: Ic158561b3f4d8ddcc092f4e8da1b3215f976fc98

.zuul.yaml

@@ -25,6 +25,13 @@
       - ^releasenotes/.*$
       - ^ceilometer/tests/.*$
 
+- job:
+    name: telemetry-dsvm-integration-centos-8s
+    nodeset: devstack-single-node-centos-8-stream
+    parent: telemetry-dsvm-integration
+    description: |
+      Functional testing for a Centos 8 stream system
+
 - project:
     templates:
       - openstack-cover-jobs
@@ -36,6 +43,8 @@
     check:
       jobs:
         - grenade-ceilometer
+        - telemetry-dsvm-integration-centos-8s:
+            irrelevant-files: *ceilometer-irrelevant-files
         - telemetry-dsvm-integration:
             irrelevant-files: *ceilometer-irrelevant-files
         - telemetry-dsvm-integration-ipv6-only:
@@ -44,6 +53,8 @@
       queue: telemetry
       jobs:
         - grenade-ceilometer
+        - telemetry-dsvm-integration-centos-8s:
+            irrelevant-files: *ceilometer-irrelevant-files
         - telemetry-dsvm-integration:
             irrelevant-files: *ceilometer-irrelevant-files
         - telemetry-dsvm-integration-ipv6-only:

devstack/plugin.sh

@@ -97,7 +97,7 @@ function _ceilometer_prepare_coordination {
 function _ceilometer_prepare_virt_drivers {
     # Only install virt drivers if we're running nova compute
     if is_service_enabled n-cpu ; then
-        if [[ "$VIRT_DRIVER" = 'libvirt' ]]; then
+        if [[ "$VIRT_DRIVER" = 'libvirt' && "$DISTRO" != 'rhel8' ]]; then
             pip_install_gr libvirt-python
         fi