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Fixes #37693 - Add check for ipv6.disable=1 in /proc/cmdline
When a system has ipv6.disable=1 in /proc/cmdline then it doesn't have ::1 but some of our services (most notably, Redis) listen on it and cause problems. Adding a check prevents users from installing in the first place. This check is based on definitions/checks/check_ipv6_disable.rb in foreman_maintain. Biggest reason to add it here is to also guard it on fresh installations.