Improve dropping privileges
Improve dropping privileges

If run as non-root and configured to drop privileges nipapd will now
complain loudly! I think this helps as opposed to just not dropping
privileges.

Part of #364.

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