Don't add to defaults in func init, just add them to cmd

transport/http/http.go

@@ -1,14 +1,9 @@
 package http
 
 import (
-	"github.com/micro/go-micro/cmd"
 	"github.com/micro/go-micro/transport"
 )
 
-func init() {
-	cmd.DefaultTransports["http"] = NewTransport
-}
-
 func NewTransport(opts ...transport.Option) transport.Transport {
 	return transport.NewTransport(opts...)
 }