Allow subclass access to properties (#1658)

zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/PerServerConnectionPool.java

@@ -49,36 +49,36 @@
 public class PerServerConnectionPool implements IConnectionPool {
     private static final Logger LOG = LoggerFactory.getLogger(PerServerConnectionPool.class);
     public static final AttributeKey<IConnectionPool> CHANNEL_ATTR = AttributeKey.newInstance("_connection_pool");
-    private final ConcurrentHashMap<EventLoop, Deque<PooledConnection>> connectionsPerEventLoop =
+    protected final ConcurrentHashMap<EventLoop, Deque<PooledConnection>> connectionsPerEventLoop =
             new ConcurrentHashMap<>();
     protected final PooledConnectionFactory pooledConnectionFactory;
 
-    private final DiscoveryResult server;
-    private final SocketAddress serverAddr;
-    private final NettyClientConnectionFactory connectionFactory;
-    private final ConnectionPoolConfig config;
-    private final IClientConfig niwsClientConfig;
-
-    private final Counter createNewConnCounter;
-    private final Counter createConnSucceededCounter;
-    private final Counter createConnFailedCounter;
-
-    private final Counter requestConnCounter;
-    private final Counter reuseConnCounter;
-    private final Counter connTakenFromPoolIsNotOpen;
-    private final Counter maxConnsPerHostExceededCounter;
-    private final Counter closeAboveHighWaterMarkCounter;
-    private final Timer connEstablishTimer;
-    private final AtomicInteger connsInPool;
-    private final AtomicInteger connsInUse;
+    protected final DiscoveryResult server;
+    protected final SocketAddress serverAddr;
+    protected final NettyClientConnectionFactory connectionFactory;
+    protected final ConnectionPoolConfig config;
+    protected final IClientConfig niwsClientConfig;
+
+    protected final Counter createNewConnCounter;
+    protected final Counter createConnSucceededCounter;
+    protected final Counter createConnFailedCounter;
+
+    protected final Counter requestConnCounter;
+    protected final Counter reuseConnCounter;
+    protected final Counter connTakenFromPoolIsNotOpen;
+    protected final Counter maxConnsPerHostExceededCounter;
+    protected final Counter closeAboveHighWaterMarkCounter;
+    protected final Timer connEstablishTimer;
+    protected final AtomicInteger connsInPool;
+    protected final AtomicInteger connsInUse;
 
     /**
      * This is the count of connections currently in progress of being established.
      * They will only be added to connsInUse _after_ establishment has completed.
      */
-    private final AtomicInteger connCreationsInProgress;
+    protected final AtomicInteger connCreationsInProgress;
 
-    private volatile boolean draining;
+    protected volatile boolean draining;
 
     public PerServerConnectionPool(
             DiscoveryResult server,