Use RelevantServices instead of node_network in AttemptToEvict.

Use of node_network here is really meant to be a proxy of "likely to
 send us blocks in the future".  RelevantServices is the right criteria
 now.

Github-Pull: bitcoin#9052
Rebased-From: d32036a

src/net.cpp

@@ -877,7 +877,7 @@ struct NodeEvictionCandidate
     int64_t nMinPingUsecTime;
     int64_t nLastBlockTime;
     int64_t nLastTXTime;
-    bool fNetworkNode;
+    bool fRelevantServices;
     bool fRelayTxes;
     bool fBloomFilter;
     CAddress addr;
@@ -902,7 +902,7 @@ static bool CompareNodeBlockTime(const NodeEvictionCandidate &a, const NodeEvict
 {
     // There is a fall-through here because it is common for a node to have many peers which have not yet relayed a block.
     if (a.nLastBlockTime != b.nLastBlockTime) return a.nLastBlockTime < b.nLastBlockTime;
-    if (a.fNetworkNode != b.fNetworkNode) return b.fNetworkNode;
+    if (a.fRelevantServices != b.fRelevantServices) return b.fRelevantServices;
     return a.nTimeConnected > b.nTimeConnected;
 }
 
@@ -936,7 +936,8 @@ static bool AttemptToEvictConnection() {
             if (node->fDisconnect)
                 continue;
             NodeEvictionCandidate candidate = {node->id, node->nTimeConnected, node->nMinPingUsecTime,
-                                               node->nLastBlockTime, node->nLastTXTime, node->fNetworkNode,
+                                               node->nLastBlockTime, node->nLastTXTime,
+                                               (node->nServices & nRelevantServices) == nRelevantServices,
                                                node->fRelayTxes, node->pfilter != NULL, node->addr, node->nKeyedNetGroup};
             vEvictionCandidates.push_back(candidate);
         }