configs/pool/common-assorted, system/essential/verbatim-files: update dnsmasq configuration.

Thus we avoid 3 nameserver limit in /etc/resolv.conf.
system/essential/verbatim-toplevel: router, system/hardware: control_router: update configs for DHCP serving.
system/essential/verbatim-files: sysctl.d/99-sysctl.conf: set vm.swappiness=100.
system/essential/verbatim-toplevel: netctl/wlan0-ifxlabs: update, fix.
system/essential/verbatim-toplevel: bluetooth/main.conf: add.
system/essential/verbatim-files: udev/rules.d/80-net-name-slot.rules: delete as it does not serve its purpose with systemd-209.