manifest: Exclude support for NM legacy ifcfg config format

Since Fedora 36, the ifcfg-rh plugin implementing support for reading
network configuration files in the legacy ifcfg format has been split
out into its own RPM subpackage.

We can now remove our configuration workaround and instead ensure that
we do not ship this plugin at all.

See: coreos#1991

manifests/fedora-coreos-base.yaml

@@ -19,7 +19,6 @@ ostree-layers:
   - overlay/05core
   - overlay/08nouveau
   - overlay/09misc
-  - overlay/14NetworkManager-plugins
   - overlay/20platform-chrony
 
 # Be minimal

manifests/fedora-coreos.yaml

@@ -134,9 +134,6 @@ postprocess:
 
 
 remove-from-packages:
-  # Drop NetworkManager support for ifcfg files, see also corresponding
-  # overlay.d/14NetworkManager-plugins
-  - [NetworkManager, /usr/lib64/NetworkManager/.*/libnm-settings-plugin-ifcfg-rh.so]
   # Drop some buggy sysusers fragments which do not match static IDs allocation:
   # https://bugzilla.redhat.com/show_bug.cgi?id=2105177
   - [dbus-common, /usr/lib/sysusers.d/dbus.conf]
@@ -169,3 +166,6 @@ exclude-packages:
   # For (datacenter/cloud oriented) servers, we want to see the details by default.
   # https://lists.fedoraproject.org/archives/list/[email protected]/thread/HSMISZ3ETWQ4ETVLWZQJ55ARZT27AAV3/
   - plymouth
+  # Do not use legacy ifcfg config format in NetworkManager
+  # See https://github.com/coreos/fedora-coreos-config/pull/1991
+  - NetworkManager-initscripts-ifcfg-rh

overlay.d/README.md

@@ -28,11 +28,6 @@ https://bugzilla.redhat.com/show_bug.cgi?id=1700056
 
 Warning about `/etc/sysconfig`.
 
-14NetworkManager-plugins
-------------------------
-
-Disables the Red Hat Linux legacy `ifcfg` format.
-
 15fcos
 ------