* Enhance IPv6 disabling logic in install script
Updated verb_ip6 to check both IPV6_METHOD and DISABLEIPV6 variables. Added disabling for all, default, and loopback interfaces, improved messaging, and redirected sysctl output to /dev/null for cleaner logs.
* Improve IPv6 disabling logic in install scripts
Updated both alpine-install.func and install.func to enhance IPv6 disabling by checking IPV6_METHOD and adding more sysctl settings. Also improved messaging and removed suppression of sysctl output in install.func.
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