Add pool tags for CLI
Add pool tags for CLI

CLI support for tags on VRFs, similar to how it works for prefixes and
VRFs.

Part of #566.

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