Next implementation steps

- Simplified UpdateRequest to the minimum required
- renamed test user to example
- removed user property from yml config, it is given by the file name.
- splitted server code analogous to command line code so that each handler has its own file.
- made viper confgi in userconfig internal
- added validation to userconfig
- added helper to combaine an IID with a v6net in userconfig

users/example.yml

@@ -1,4 +1,3 @@
-username: test
 password: $2a$10$ymHFfGjKINWsUKwEo5xp.efN6DR6NkiRCXsbH4VWo0Nnzma8Yc.82
 router: 
   DNS: brandfeld.dyn.local