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Had to edit the script to allow AuthNoPriv

To allow AuthNoPriv I needed to delete any references to $priv_password and $priv_prot in get_snmp_session_v3().
Also needed to update the USM.pm perl module file to allow SHA-256 to work. See : https://github.com/Napsty/scripts/blob/master/perl-net-snmp-sha2/USM.pm

Other than, works pretty good.