Static DHCP scripts SELinux problem setting hostname

Description of problem:

As discovered in https://bugzilla.redhat.com/show_bug.cgi?id=2111632 the dispatcher scripts don't have permission to set the hostname directly. We need to use systemd-run to get them into an appropriate SELinux context.

I doubt the static DHCP scripts are still being used intentionally since we have proper static IP support now, but since the fix is pretty trivial we should go ahead and do it since technically the feature is still supported.

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