RFR(S): 8153945: Track if log configuration has changed during runtime

[Marcus Larsson]

Hi,

Please review the following small patch to add a "(reconfigured)" label 
to log outputs that have been reconfigured after VM startup.

The change is based on the patch for 8190346 since it has a conflicting 
change in test_logConfiguration.cpp.

Issue:
https://bugs.openjdk.java.net/browse/JDK-8153945

Webrev:
http://cr.openjdk.java.net/~mlarsson/8153945/webrev.00

Thanks,
Marcus