add all the registries as packages in go-plugins, replace etcd v2 with etcd v3

service.go

@@ -0,0 +1,17 @@
+// Package service uses the registry service
+package service
+
+import (
+	"github.com/micro/go-micro/config/cmd"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/registry/service"
+)
+
+func init() {
+	cmd.DefaultRegistries["service"] = NewRegistry
+}
+
+// NewRegistry returns a new registry service client
+func NewRegistry(opts ...registry.Option) registry.Registry {
+	return service.NewRegistry(opts...)
+}