Delete prefixes in schema before removing schema
Delete prefixes in schema before removing schema

First remove all IPv4 and IPv6 addresses recursively in a schema before
we delete the schema itself.

Fixes #152

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