hg: jdk/hs: 8190346: improve unified JVM logging help message and warnings

[marcus.larsson at oracle.com]

Changeset: 9637557def32
Author:    mlarsson
Date:      2018-02-28 09:30 +0100
URL:       http://hg.openjdk.java.net/jdk/hs/rev/9637557def32

8190346: improve unified JVM logging help message and warnings
Reviewed-by: lfoltan, rehn, hseigel

! src/hotspot/share/logging/logConfiguration.cpp
! src/hotspot/share/logging/logConfiguration.hpp
! src/hotspot/share/logging/logFileOutput.cpp
! src/hotspot/share/logging/logFileOutput.hpp
! src/hotspot/share/logging/logOutput.cpp
! src/hotspot/share/logging/logSelection.cpp
! src/hotspot/share/logging/logSelection.hpp
! src/hotspot/share/logging/logSelectionList.cpp
! src/hotspot/share/logging/logTagSet.cpp
! src/hotspot/share/runtime/arguments.cpp
! test/hotspot/gtest/logging/test_logConfiguration.cpp
! test/hotspot/gtest/logging/test_logTagSetDescriptions.cpp
! test/hotspot/jtreg/serviceability/logging/TestMultipleXlogArgs.java