p2p: add MAX_FEELER_CONNECTIONS constant

src/init.cpp

@@ -1879,7 +1879,7 @@ bool AppInitMain(NodeContext& node)
     connOptions.m_max_outbound_full_relay = std::min(MAX_OUTBOUND_FULL_RELAY_CONNECTIONS, connOptions.nMaxConnections);
     connOptions.m_max_outbound_block_relay = std::min(MAX_BLOCKS_ONLY_CONNECTIONS, connOptions.nMaxConnections-connOptions.m_max_outbound_full_relay);
     connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS;
-    connOptions.nMaxFeeler = 1;
+    connOptions.nMaxFeeler = MAX_FEELER_CONNECTIONS;
     connOptions.nBestHeight = chain_active_height;
     connOptions.uiInterface = &uiInterface;
     connOptions.m_banman = node.banman.get();

src/net.h

@@ -62,6 +62,8 @@ static const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8;
 static const int MAX_ADDNODE_CONNECTIONS = 8;
 /** Maximum number of block-relay-only outgoing connections */
 static const int MAX_BLOCKS_ONLY_CONNECTIONS = 2;
+/** Maximum number of feeler connections */
+static const int MAX_FEELER_CONNECTIONS = 1;
 /** -listen default */
 static const bool DEFAULT_LISTEN = true;
 /** -upnp default */