Keep addrman's nService bits consistent with outbound observations

src/addrman.h

@@ -256,6 +256,9 @@ protected:
     //! Mark an entry as currently-connected-to.
     void Connected_(const CService &addr, int64_t nTime);
 
+    //! Update an entry's service bits.
+    void SetServices_(const CService &addr, uint64_t nServices);
+
 public:
     /**
      * serialized format:
@@ -589,6 +592,14 @@ public:
         }
     }
 
+    void SetServices(const CService &addr, uint64_t nServices)
+    {
+        LOCK(cs);
+        Check();
+        SetServices_(addr, nServices);
+        Check();
+    }
+
 };
 
 #endif // BITCOIN_ADDRMAN_H