fill in README
disable system tuning by default
convert whitespace in net.ipv4.ip_local_port_range to a tab

To match the output from sysctl to avoid:

    Notice: /Stage[main]/Port389::Tune/Sysctl[net.ipv4.ip_local_port_range]/value:
    changed live value from '1024   65000' to '1024 65000'