Enable Mesh-VPN by default without enabling bandwidth limiting

Enable Mesh-VPN by default without enabling bandwidth limiting

See merge request !3

Lower vpn MTU from 1426 to 1312 because of DS-Lite connections. See thread on developer mailinglist "Änderung der MTU für DS-Lite Anschlüsse"

Signed-off-by: Clemens John <clemens.john@floh1111.de>

Example:
0.5.3 < 0.5.3+0-dev
0.5.3 > 0.5.2.99+0-dev