[stable-only] zuul: handle broken jobs

The "metalsmith-integration-glance-netboot-cirros-direct" job was
removed over 3 years ago. Since this branch is going EOL soon, simply
drop the job.

Also make the openstacksdk-functional-devstack-networking job non-voting
since it is failing too often, drop the
dib-nodepool-functional-openstack-centos-8-stream-src job which is no
longer supported in nodepool and stop running non-voting jobs in gate.

Change-Id: I5348efd5eb13258192baf1a6b324f0b6d956ce38

zuul.d/metal-jobs.yaml

@@ -1,12 +1,6 @@
 ---
 # Definitions of Ironic based jobs with a dedicated project entry to keep them
 # out of general entry.
-- job:
-    name: metalsmith-integration-openstacksdk-src
-    parent: metalsmith-integration-glance-netboot-cirros-direct
-    required-projects:
-      - openstack/openstacksdk
-
 - job:
     name: bifrost-integration-openstacksdk-src
     parent: bifrost-integration-tinyipa-ubuntu-focal
@@ -28,5 +22,3 @@
             voting: false
         - bifrost-integration-openstacksdk-src:
             voting: false
-        - metalsmith-integration-openstacksdk-src:
-            voting: false

zuul.d/project.yaml

@@ -17,10 +17,9 @@
         - opendev-buildset-registry
         - nodepool-build-image-siblings:
             voting: false
-        - dib-nodepool-functional-openstack-centos-8-stream-src:
-            voting: false
         - openstacksdk-functional-devstack
-        - openstacksdk-functional-devstack-networking
+        - openstacksdk-functional-devstack-networking:
+            voting: false
         - openstacksdk-functional-devstack-networking-ext
         - openstacksdk-functional-devstack-magnum:
             voting: false
@@ -37,10 +36,5 @@
     gate:
       jobs:
         - opendev-buildset-registry
-        - nodepool-build-image-siblings:
-            voting: false
-        - dib-nodepool-functional-openstack-centos-8-stream-src:
-            voting: false
         - openstacksdk-functional-devstack
-        - openstacksdk-functional-devstack-networking
         - openstacksdk-functional-devstack-networking-ext