NETTY-417 client channel still open after close and wait

* Fixed a bug in SslHandler where a write attempt made after SSLEngine is closed result in unnotified future.  Fixed by respecting the case where SslEngineResult.Status == CLOSED

Author: trustin

src/main/java/org/jboss/netty/handler/ssl/SslHandler.java

@@ -659,6 +659,11 @@ private ChannelFuture wrap(ChannelHandlerContext context, Channel channel)
                                     channel, future, msg, channel.getRemoteAddress());
                             offerEncryptedWriteRequest(encryptedWrite);
                             offered = true;
+                        } else if (result.getStatus() == Status.CLOSED) {
+                            // SSLEngine has been closed already.
+                            // Any further write attempts should be denied.
+                            success = false;
+                            break;
                         } else {
                             final HandshakeStatus handshakeStatus = result.getHandshakeStatus();
                             handleRenegotiation(handshakeStatus);