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initrd: disable ipv6 when 'off|none' is set in the 'ip' option

Antonio Cardace requested to merge ac/cmdline_reader_ipv6_off into master

This is potentially a breaking change, formerly speciyfing 'none|off' in the kernel cmdline option 'ip' was understood by the dracut network-module as doing 'ipv6.method=auto' which is clearly incosistent with the 'off' naming, thus 'off|none' now means to actually disable both ipv6 and ipv4 (unless a static ip is provided).

Unit test added.

Signed-off-by: Antonio Cardace

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