[#2358] SslHandler.safeClose(...) may not notify the ChannelPromise

Motivation:
In SslHandler.safeClose(...) we attach a ChannelFutureListener to the flushFuture and will notify the ChannelPromise which was used for close(...) in it. The problem here is that we only call ChannelHandlerContext.close(ChannelPromise) if Channel.isActive() is true and otherwise not notify it at all. We should just call ChannelHandlerContext.close(ChannelPromise) in all cases.

Modifications:
Always call ChannelHandlerContext.close(ChannelPromise) in the ChannelFutureListeiner

Result:
ChannelPromise used for close the Channel is notified in all cases

handler/src/main/java/io/netty/handler/ssl/SslHandler.java

@@ -1171,10 +1171,10 @@ public class SslHandler extends ByteToMessageDecoder implements ChannelOutboundH
                 if (timeoutFuture != null) {
                     timeoutFuture.cancel(false);
                 }
-                if (ctx.channel().isActive()) {
+                // Trigger the close in all cases to make sure the promise is notified
+                // See https://github.com/netty/netty/issues/2358
                 ctx.close(promise);
             }
-            }
         });
     }