hg: jdk9/hs/hotspot: 8157948: UL allows same log file with multiple file=

[marcus.larsson at oracle.com]

Changeset: 8e33ab1e0856
Author:    mlarsson
Date:      2016-08-29 14:11 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/8e33ab1e0856

8157948: UL allows same log file with multiple file=
Reviewed-by: dholmes, rehn

! src/share/vm/logging/log.cpp
! src/share/vm/logging/logConfiguration.cpp
! src/share/vm/logging/logConfiguration.hpp
! src/share/vm/logging/logFileOutput.cpp
! src/share/vm/logging/logFileOutput.hpp
! test/native/logging/test_logConfiguration.cpp
! test/native/logging/test_logFileOutput.cpp