copy paths, first path modification actions

route/bgp.go

route/path.go

route/static.go

routingtable/filter/actions/as_path_prepend_action.go

routingtable/filter/actions/filter_action.go

routingtable/filter/actions/set_local_pref_action.go

routingtable/filter/actions/set_nexthop_action.go