Changed default log4j log level from "WARNING" to "WARN"

Bug: 474674
Change-Id: I8be8934cf6cb3ee60567b59f8e836475efb780ac
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

org.eclipse.jgit.pgm/resources/log4j.properties

@@ -1,4 +1,4 @@
-log4j.rootLogger=WARNING, stderr
+log4j.rootLogger=WARN, stderr
 
 log4j.appender.stderr=org.apache.log4j.ConsoleAppender
 log4j.appender.stderr.Target=System.err