Fix bug: processing MPLS label in nexthop update message
Fix bug: processing MPLS label in nexthop update message

osrg/gobgp,a16/gobgp,j-kato/gobgp,a16/gobgp,tamihiro/gobgp,tamihiro/gobgp,tamihiro/gobgp,j-kato/gobgp,a16/gobgp,fujita/gobgp,a16/gobgp,fujita/gobgp,osrg/gobgp,osrg/gobgp,fujita/gobgp,osrg/gobgp,a16/gobgp,fujita/gobgp,a16/gobgp,tamihiro/gobgp,j-kato/gobgp,a16/gobgp