Remove unused code
Remove unused code

Since we don't have argument for v4/v6 address anymore we can remove sanity
checking stuff for it.

plajjan/vrnetlab,mzagozen/vrnetlab,plajjan/vrnetlab,mzagozen/vrnetlab,holmahenkel/vrnetlab,bdreisbach/vrnetlab,bdreisbach/vrnetlab,holmahenkel/vrnetlab