The value of vRtrInetStaticRouteNextHop specifies the ip address
of the next hop for the static route and it depends on the value
of vRtrInetStaticRouteStaticType.
At most only one of the values of the three objects:
vRtrInetStaticRouteNextHop, vRtrInetStaticRouteNextHopIf and
vRtrInetStaticRouteNHTunnelName can be a non null string.
If the value of vRtrInetStaticRouteStaticType is 'unknown' or
'blackHole' then the value of vRtrInetStaticRouteNextHopType should
be 'unknown' and the values of vRtrInetStaticRouteNextHop,
vRtrInetStaticRouteNextHopIf, vRtrInetStaticRouteNHTunnelName
should be null strings.