move all imports to own domain

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/socket/socket.go

@@ -1,10 +1,10 @@
 // Package socket provides a pseudo socket
-package socket
+package socket // import "go.unistack.org/micro/v3/util/socket"
 
 import (
 	"io"
 
-	"github.com/unistack-org/micro/v3/network/transport"
+	"go.unistack.org/micro/v3/network/transport"
 )
 
 // Socket is our pseudo socket for transport.Socket