Loggers#getLogger static method to take into account the logger prefix

Improved LoggingListener (which reads and applies @TestLogging annotation) to take into account the logger prefix. We can now use the @TestLogging annotation and specify either the whole package name (e.g. o.e.action.metadata) or only the package name without the logger prefix (action.metadata), the custom log level will be properly applied in both cases

src/main/java/org/elasticsearch/common/logging/Loggers.java

@@ -110,7 +110,7 @@ public class Loggers {
     }
 
     public static ESLogger getLogger(String s) {
-        return ESLoggerFactory.getLogger(s);
+        return ESLoggerFactory.getLogger(getLoggerName(s));
     }
 
     public static ESLogger getLogger(Class clazz) {

src/test/java/org/elasticsearch/junit/listeners/LoggingListener.java

@@ -20,6 +20,7 @@ package org.elasticsearch.junit.listeners;
 
 import org.elasticsearch.common.logging.ESLogger;
 import org.elasticsearch.common.logging.ESLoggerFactory;
+import org.elasticsearch.common.logging.Loggers;
 import org.elasticsearch.junit.annotations.TestLogging;
 import org.junit.runner.Description;
 import org.junit.runner.notification.RunListener;
@@ -75,6 +76,6 @@ public class LoggingListener extends RunListener {
         if (loggerName.equalsIgnoreCase("_root")) {
             return ESLoggerFactory.getRootLogger();
         }
-        return ESLoggerFactory.getLogger(loggerName);
+        return Loggers.getLogger(loggerName);
     }
 }