overlay.d: create new 30gcp-udev-rules overlay

We previously had the 65-gce-disk-naming.rules under the 05core
overlay. This commit makes a new overlay.d entry specifically for
the GCP rules, in this way we can track it and have a better
maintenance

Signed-off-by: Renata Ravanelli <rravanel@redhat.com>
(cherry picked from commit 9da4327)

overlay.d/30gcp-udev-rules/statoverride

@@ -0,0 +1,2 @@
+# Config file for overriding permission bits on overlay files/dirs
+# Format: =<file mode in decimal> <absolute path to a file or directory>

overlay.d/README.md

@@ -66,3 +66,17 @@ bits to include the rules in the initramfs too.
 [1] https://github.com/coreos/fedora-coreos-tracker/issues/1383
 [2] https://github.com/Azure/WALinuxAgent/pull/1622
 [3] https://src.fedoraproject.org/rpms/WALinuxAgent/pull-request/4
+
+
+30gcp-udev-rules
+-------------------
+
+Add udev rules and scripts needed from google-guest-configs [1] for disk
+configuration in GCP, such as local SSD controllers (nvme and scsi).
+
+There is an opened BZ [2] requesting a subpackage of google-compute-engine-guest-configs
+containing only what we need. Once we get it, we can include this rpm in the
+OS (Fedora/RHEL) and drop this module entirely.
+
+[1] https://github.com/GoogleCloudPlatform/guest-configs/tree/master/src/lib/udev
+[2] https://bugzilla.redhat.com/show_bug.cgi?id=218286