Update VRF info from parent prefix
Update VRF info from parent prefix

When adding a prefix from another prefix the VRF info is now fetched
from the prefix we are allocating from.

Fixes #386.

ettrig/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,ettrig/NIPAP,plajjan/NIPAP,fredsod/NIPAP,plajjan/NIPAP,plajjan/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,garberg/NIPAP,garberg/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,fredsod/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,plajjan/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,SoundGoof/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP