Remove CentOS 8 jobs

CentOS 8 is no longer available as a test OS, so I am removing those
jobs.

Change-Id: I998776e2a8abf22bf28c530ecd8f2a0fa5d1e7fa
Signed-off-by: Michael Johnson <johnsomor@gmail.com>
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 0d5a92b..4d655b7 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -39,26 +39,6 @@
           - 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 +750,6 @@
                 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