Apply gofmt

examples/bgp/main_ipv6.go

examples/netlink/main_ipv6.go

protocols/bgp/packet/encoder_test.go

protocols/bgp/server/bmp_router_test.go

protocols/bgp/server/bmp_server_test.go

protocols/bgp/server/fsm_address_family_test.go

protocols/bgp/server/fsm_open_sent_test.go

protocols/bgp/server/fsm_test.go

route/bgp_test.go

route/route_test.go

routingtable/adjRIBIn/adj_rib_in_test.go

routingtable/adjRIBOut/adj_rib_out_test.go

routingtable/client_manager_test.go

routingtable/contributing_asn_list.go

...ngtable/filter/actions/add_large_community_action_test.go

routingtable/filter/term_condition_test.go