Remove spurious libnetwork vendor entry.
Not sure how this got added in there...
@@ -45,8 +45,6 @@ github.com/grpc-ecosystem/go-grpc-middleware 3c51f7f332123e8be5a157c0802a
# libnetwork
-# When updating, also update LIBNETWORK_COMMIT in hack/dockerfile/install/proxy.installer accordingly
-github.com/docker/libnetwork 64b7a4574d1426139437d20e81c0b6d391130ec8
github.com/docker/go-events e31b211e4f1cd09aa76fe4ac244571fab96ae47f
github.com/armon/go-radix e39d623f12e8e41c7b5529e9a9dd67a1e2261f80
github.com/armon/go-metrics eb0af217e5e9747e41dd5303755356b62d28e3ec
