hg: jdk8/tl/jdk: 8026499: Root Logger level can be reset unexpectedly

[daniel.fuchs at oracle.com]

Changeset: c81125493ca6
Author:    dfuchs
Date:      2013-10-21 12:00 +0200
URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/c81125493ca6

8026499: Root Logger level can be reset unexpectedly
Summary: This fix prevents the logger's level to be re-initialized if it has already been initialized.
Reviewed-by: mchung

! src/share/classes/java/util/logging/LogManager.java
! src/share/classes/java/util/logging/Logger.java
+ test/java/util/logging/LogManager/RootLogger/setLevel/TestRootLoggerLevel.java