Fix prefix list search key 'family'
Fix prefix list search key 'family'

The prefix_list API call search key 'family' did not work as it was
handled as any other prefix property (each one residing in its own
column in the ip_net_plan table). The search query was modified to
calculate the family from the prefix and match against this value
instead.

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