Enabling log4j.rootLogger configuration parameter

Synopsis: By default, logger is using TRACE parameter which leads
          to disk space havoc.

Fix:      One can configure log4j.rootLogger to use INFO parameter
          for example.

Change-Id: I3deb89306ca5259c00764e4968b0f668312c66f0
diff --git a/README.rst b/README.rst
index da9d0b4..4fa2d74 100644
--- a/README.rst
+++ b/README.rst
@@ -102,6 +102,7 @@
         members:
         - host: 127.0.0.1
           id: 1
+        rootlogger: "INFO, CONSOLE"
       control:
         version: 2.2
         enabled: true