Remove old operating systems

CentOS 8 and Ubuntu Bionic are no longer used in any active branch.

Change-Id: I57d3ed7b31eec5f1eca4a816c0adac1ea9f540e6
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 0d5a92b..34b1d8b 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -1,14 +1,4 @@
 - nodeset:
-    name: octavia-single-node-ubuntu-bionic
-    nodes:
-      - name: controller
-        label: nested-virt-ubuntu-bionic
-    groups:
-      - name: tempest
-        nodes:
-          - controller
-
-- nodeset:
     name: octavia-single-node-ubuntu-focal
     nodes:
       - name: controller
@@ -39,26 +29,6 @@
           - controller
 
 - nodeset:
-    name: octavia-single-node-centos-8
-    nodes:
-      - name: controller
-        label: nested-virt-centos-8
-    groups:
-      - name: tempest
-        nodes:
-          - controller
-
-- nodeset:
-    name: octavia-single-node-centos-8-stream
-    nodes:
-      - name: controller
-        label: nested-virt-centos-8-stream
-    groups:
-      - name: tempest
-        nodes:
-          - controller
-
-- nodeset:
     name: octavia-single-node-centos-9-stream
     nodes:
       - name: controller
@@ -770,26 +740,6 @@
                 loadbalancer_topology: ACTIVE_STANDBY
 
 - job:
-    name: octavia-v2-dsvm-scenario-centos-8
-    parent: octavia-v2-dsvm-scenario
-    nodeset: octavia-single-node-centos-8
-    vars:
-      devstack_localrc:
-        OCTAVIA_AMP_BASE_OS: centos
-        OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 8
-        OCTAVIA_AMP_IMAGE_SIZE: 3
-
-- job:
-    name: octavia-v2-dsvm-scenario-centos-8-stream
-    parent: octavia-v2-dsvm-scenario
-    nodeset: octavia-single-node-centos-8-stream
-    vars:
-      devstack_localrc:
-        OCTAVIA_AMP_BASE_OS: centos
-        OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 8-stream
-        OCTAVIA_AMP_IMAGE_SIZE: 3
-
-- job:
     name: octavia-v2-dsvm-scenario-centos-9-stream
     parent: octavia-v2-dsvm-scenario
     nodeset: octavia-single-node-centos-9-stream