Fix all the golint complaints about newly added changes

Do not use func(this *server), such generic names should not be used
for writing struct methods.

pkg/controller/rpc/rpc.go

@@ -21,6 +21,7 @@ import (
 	"github.com/gorilla/rpc/v2/json"
 )
 
+// Server new rpc server container
 type Server struct {
 	*rpc.Server
 }