openshift/kubernetes: stop modifying machine-os-content (openshift#49156)

That image isn't actually used in the cluster. We already have
code in these same files to update the real image that gets used
(`rhel-coreos`), so let's just drop these references.

See also openshift/kubernetes#1805 (comment)
and following.

See also https://issues.redhat.com/browse/MCO-392.

Author: jlebon

ci-operator/config/openshift/kubernetes/openshift-kubernetes-master.yaml

@@ -31,10 +31,6 @@ base_images:
     name: test
     namespace: ocp-kni
     tag: dev-scripts
-  machine-os-content-base:
-    name: "4.16"
-    namespace: ocp
-    tag: machine-os-content
   oc-rpms:
     name: "4.16"
     namespace: ocp
@@ -90,15 +86,6 @@ images:
       as:
       - registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.21-openshift-4.16
   to: kubernetes-tests
-- context_dir: openshift-hack/images/os/
-  inputs:
-    base-machine-with-rpms:
-      as:
-      - centos:stream9
-    machine-os-content-base:
-      as:
-      - registry.svc.ci.openshift.org/openshift/origin-v4.0:machine-os-content
-  to: machine-os-content
 - dockerfile_literal: |
     # This uses the new rhel-coreos base image
     # https://github.com/openshift/enhancements/blob/master/enhancements/ocp-coreos-layering/ocp-coreos-layering.md
@@ -146,7 +133,6 @@ promotion:
   - additional_images:
       artifacts: artifacts
     excluded_images:
-    - machine-os-content
     - rhel-coreos
     name: "4.16"
     namespace: ocp

ci-operator/config/openshift/kubernetes/openshift-kubernetes-release-4.16.yaml

@@ -31,10 +31,6 @@ base_images:
     name: test
     namespace: ocp-kni
     tag: dev-scripts
-  machine-os-content-base:
-    name: "4.16"
-    namespace: ocp
-    tag: machine-os-content
   oc-rpms:
     name: "4.16"
     namespace: ocp
@@ -90,15 +86,6 @@ images:
       as:
       - registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.21-openshift-4.16
   to: kubernetes-tests
-- context_dir: openshift-hack/images/os/
-  inputs:
-    base-machine-with-rpms:
-      as:
-      - centos:stream9
-    machine-os-content-base:
-      as:
-      - registry.svc.ci.openshift.org/openshift/origin-v4.0:machine-os-content
-  to: machine-os-content
 - dockerfile_literal: |
     # This uses the new rhel-coreos base image
     # https://github.com/openshift/enhancements/blob/master/enhancements/ocp-coreos-layering/ocp-coreos-layering.md
@@ -147,7 +134,6 @@ promotion:
       artifacts: artifacts
     disabled: true
     excluded_images:
-    - machine-os-content
     - rhel-coreos
     name: "4.16"
     namespace: ocp

ci-operator/config/openshift/kubernetes/openshift-kubernetes-release-4.17.yaml

@@ -31,10 +31,6 @@ base_images:
     name: test
     namespace: ocp-kni
     tag: dev-scripts
-  machine-os-content-base:
-    name: "4.17"
-    namespace: ocp
-    tag: machine-os-content
   oc-rpms:
     name: "4.17"
     namespace: ocp
@@ -90,15 +86,6 @@ images:
       as:
       - registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.21-openshift-4.16
   to: kubernetes-tests
-- context_dir: openshift-hack/images/os/
-  inputs:
-    base-machine-with-rpms:
-      as:
-      - centos:stream9
-    machine-os-content-base:
-      as:
-      - registry.svc.ci.openshift.org/openshift/origin-v4.0:machine-os-content
-  to: machine-os-content
 - dockerfile_literal: |
     # This uses the new rhel-coreos base image
     # https://github.com/openshift/enhancements/blob/master/enhancements/ocp-coreos-layering/ocp-coreos-layering.md
@@ -146,7 +133,6 @@ promotion:
   - additional_images:
       artifacts: artifacts
     excluded_images:
-    - machine-os-content
     - rhel-coreos
     name: "4.17"
     namespace: ocp