Clusterred appender should consider the categories.

It turns out that whenever the clusterred appender is used the log event is passed to all actual appenders.
The actual appender's category is ignored.

Signed-off-by: Vladimir Mitev <idalv@users.noreply.github.com>

lib/appenders/clustered.js

@@ -71,7 +71,10 @@ function createAppender(config) {
 			if (config.actualAppenders) {
 				var size = config.actualAppenders.length;
 				for(var i = 0; i < size; i++) {
-					config.actualAppenders[i](loggingEvent);
+			                if (!config.appenders[i].category || config.appenders[i].category === loggingEvent.categoryName) {
+						// Relying on the index is not a good practice but otherwise the change would have been bigger.
+						config.actualAppenders[i](loggingEvent);
+                    			}
 				}
 			}
 		}