In case of remote routes, the address of the next system en route.
This member is complemented by vRtrStaticRouteNextHopUnnumberedIf.
Atmost only one of them can be non-null. If vRtrStaticRouteNextHop
is '0.0.0.0' and vRtrStaticRouteNextHopUnnumberedIf is a null
string then this static route is configured as a black hole.