[net] remove CConnman::SetServices

It just forwards calls to CAddrMan::SetServices.

src/net.h

@@ -921,7 +921,6 @@ public:
     };
 
     // Addrman functions
-    void SetServices(const CService &addr, ServiceFlags nServices);
     void MarkAddressGood(const CAddress& addr);
     bool AddNewAddresses(const std::vector<CAddress>& vAddr, const CAddress& addrFrom, int64_t nTimePenalty = 0);
     std::vector<CAddress> GetAddresses(size_t max_addresses, size_t max_pct);