Zone index can be used to bind IP address with some interface (e.f. 220.127.116.11@eth1),
more details: https://tools.ietf.org/html/rfc4007#section-6.
The firstname.lastname@example.org introduces inet:ip-address-no-zone types,
that should be prefered over inet:ip-address types if zone index is not needed.
Change inet:ip-address to ip-address-no-zone in yang models after we bump ODL dependencies to Boron again.
Following patch was not cherry-picked to Beryllium