Do not increment nAttempts by more than one for every Good connection.

This slows the increase of the nAttempts in addrman while partitioned,
 even if the node hasn't yet noticed the partitioning.

src/addrman.cpp

@@ -199,6 +199,9 @@ void CAddrMan::MakeTried(CAddrInfo& info, int nId)
 void CAddrMan::Good_(const CService& addr, int64_t nTime)
 {
     int nId;
+
+    nLastGood = nTime;
+
     CAddrInfo* pinfo = Find(addr, &nId);
 
     // if not found, bail out
@@ -329,7 +332,10 @@ void CAddrMan::Attempt_(const CService& addr, bool fCountFailure, int64_t nTime)
 
     // update info
     info.nLastTry = nTime;
-    if (fCountFailure) info.nAttempts++;
+    if (fCountFailure && info.nLastCountAttempt < nLastGood) {
+        info.nLastCountAttempt = nTime;
+        info.nAttempts++;
+    }
 }
 
 CAddrInfo CAddrMan::Select_(bool newOnly)

src/addrman.h

@@ -30,6 +30,9 @@ class CAddrInfo : public CAddress
     //! last try whatsoever by us (memory only)
     int64_t nLastTry;
 
+    //! last counted attempt (memory only)
+    int64_t nLastCountAttempt;
+
 private:
     //! where knowledge about this address first came from
     CNetAddr source;
@@ -67,6 +70,7 @@ class CAddrInfo : public CAddress
     {
         nLastSuccess = 0;
         nLastTry = 0;
+        nLastCountAttempt = 0;
         nAttempts = 0;
         nRefCount = 0;
         fInTried = false;
@@ -205,6 +209,9 @@ class CAddrMan
     //! list of "new" buckets
     int vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE];
 
+    //! last time Good was called (memory only)
+    int64_t nLastGood;
+
 protected:
     //! secret key to randomize bucket select with
     uint256 nKey;
@@ -458,6 +465,7 @@ class CAddrMan
         nIdCount = 0;
         nTried = 0;
         nNew = 0;
+        nLastGood = 1; //Initially at 1 so that "never" is strictly worse.
     }
 
     CAddrMan()

src/net.cpp

@@ -1432,7 +1432,7 @@ void ThreadOpenConnections()
         }
 
         if (addrConnect.IsValid())
-            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= min(nMaxConnections - 1, 2), &grant);
+            OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant);
     }
 }