Pull Request for fix to "A Guide to Rolling File Appenders" article. (#919)

* First test with log4j rolling appenders

* small fix

* Log4j rolling appender

* First set up with rolling file on log4j 2

* Added logback code.

* log4j2 more detailed example

* log4j2 more detailed example

* Improved names and examples

* Fixed configurations

* improved configs

* formatted

* Final fix

* fixed formatting

* Formatting fix

* Fix sample apps to avoid try / catch

* Fix request to replace files

* Fix end lines

* Log4j2 logger is shot down at the end.

log4j/src/main/java/com/baeldung/log4j2/Log4j2RollingExample.java

@@ -1,7 +1,5 @@
 package com.baeldung.log4j2;
 
-import java.util.stream.IntStream;
-
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -14,6 +12,7 @@ public class Log4j2RollingExample {
             logger.info("This is the {} time I say 'Hello World'.", i);
             Thread.sleep(100);
         }
+        LogManager.shutdown();
     }
 
 }