message: Expand the namespaces of the SINGLETON_MANAGER_REGISTRATION macro.
diff: @@ -44,8 +44,8 @@ public:
  */
  #define SINGLETON_MANAGER_REGISTRATION(NAME) \
  static constexpr char NAME##_singleton_name[] = #NAME "_singleton"; \
  - static Registry::RegisterFactory<Singleton::RegistrationImpl<NAME##_singleton_name>, \
  - Singleton::Registration> \
  + static Envoy::Registry::RegisterFactory< \
  + Envoy::Singleton::RegistrationImpl<NAME##_singleton_name>, Envoy::Singleton::Registration> \
  NAME##_singleton_registered_;
  #define SINGLETON_MANAGER_REGISTERED_NAME(NAME) NAME##_singleton_name
  