[CentOS] IPV6 auto configuration cannot be disabled from if script.

> I could have written a script to remove IPV6 link local address but
> there should be a basic option for that.
>
>
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Just to emphasise this as I guess it hasn't been clear enough yet...

An IPv6 config with no FE80:: address is a broken config.

This address should always be on an IPv6 enabled interface, being generated
automatically, and is not the same thing as IPv6 auto configuration
(SLAAC).