system-configuration: Add cloud-utils-growpart

This is a relatively small shell script, and was already split out
from cloud-init to support use cases like ours.

systemd-repart is a lot nicer but it isn't yet designed
for our use case (root is not Discoverable Partition).

Also systemd-repart doesn't handle LVM which this script
tries to support.

(IMO the real solution to stuff like this is either Stratis
 or equivalent)

tier-1/system-configuration.yaml

@@ -12,6 +12,8 @@ packages:
   - e2fsprogs
   - sg3_utils
   - xfsprogs
+  ## This is generally useful... https://github.com/CentOS/centos-bootc/issues/394
+  - cloud-utils-growpart
   # User configuration
   - passwd
   - shadow-utils