Since we're replacing the k3s rolebindings.yaml in rke2, we should allow
renaming this so that we can use the white-labeled name downstream.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
If the ip_set kernel module is not available we should warn
that the network policy controller can not start rather than
cause a fatal error.
Also adds module probing and config checks for ip_set.