Disable udp checksums by default
Fix dnsmasq host overrides 'enabled' check.
Merge pull request #624 from PiBa-NL/dns_hostoverride_fix

Fix dnsmasq host overrides 'enabled' check.
Do not show URL twice, it helps ticket #2978
Fix IPv6 Prefix ID default value

. Always initialize it to 0 when it's undefined
. Remove unecessary initializations and checks
. Bump config version to 9.5
. Write an upgrade config function to initialize old configs properly
Allow codel to be activated as an option for the specific queues or as its own discipline without any childs
Merge remote-tracking branch 'upstream/master'