Support disabling NFSv2, NFSv3 in (redhat) /etc/sysconfig/nfs

[bschonec]

Add the ability to turn off NFS v2 and v3 via the (rhel variants) /etc/sysconfig/nfs file: From Red Hat documentation:

Procedure 8.2. Configuring an NFSv4-only Server

To configure your NFS server to support only NFS version 4.0 and later:
Disable NFSv2, NFSv3, and UDP by adding the following line to the /etc/sysconfig/nfs configuration file:
RPCNFSDARGS="-N 2 -N 3 -U"

[treydock]

The mechanism to do this is using /etc/nfs.conf at least in RHEL9 and I believe RHEL8 did this too.

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/configuring_and_using_network_file_services/deploying-an-nfs-server_configuring-and-using-network-file-services#configuring-an-nfsv4-only-server_deploying-an-nfs-server

This is how I've been handling those config changes:

https://github.com/treydock/puppet-nfs/blob/1.x/lib/puppet/type/nfs_config.rb

This module could likely do something similar with Augeas.