Consolidate individual references to the current maximum peer connection

value of 125 into a single constant declaration.

src/net.h

@@ -56,6 +56,8 @@ static const bool DEFAULT_UPNP = false;
 #endif
 /** The maximum number of entries in mapAskFor */
 static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
+/** The maximum number of peer connections to maintain. */
+static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125;
 
 unsigned int ReceiveFloodSize();
 unsigned int SendBufferSize();