message: [addrman] Remove AddrMan friends
  AddrMan's friends both inherit from AddrMan, so just make the private
  member protected and remove the friends.
diff: @@ -53,6 +53,7 @@ static constexpr int32_t DEFAULT_ADDRMAN_CONSISTENCY_CHECKS{0};
  */
  class AddrMan
  {
  +protected:
  const std::unique_ptr<AddrManImpl> m_impl;
  public:
  @@ -135,9 +136,6 @@ public:
  void SetServices(const CService& addr, ServiceFlags nServices);
  const std::vector<bool>& GetAsmap() const;
  -
  - friend class AddrManTest;
  - friend class AddrManDeterministic;
  };
  #endif // BITCOIN_ADDRMAN_H
  