Wrap errors (#161)

config/server.go

net/prefix.go

protocols/bgp/packet/decoder.go

protocols/bgp/packet/mp_reach_nlri.go

protocols/bgp/packet/nlri.go

protocols/bgp/packet/path_attributes.go

protocols/bgp/server/bmp_router.go

protocols/bgp/server/bmp_server.go

protocols/bgp/server/fsm.go

protocols/bgp/server/fsm_established.go

protocols/bgp/server/server.go

protocols/bgp/server/update_helper.go

protocols/bgp/server/update_helper_test.go

protocols/bmp/packet/decode.go

protocols/bmp/packet/initiation_message.go

protocols/bmp/packet/peer_down.go

protocols/bmp/packet/peer_up.go

protocols/bmp/packet/route_mirroring.go

protocols/bmp/packet/route_monitoring.go

protocols/bmp/packet/stats_report.go