RFR (S): 8153174: Remove trailing comma from log configuration listings

[Marcus Larsson]

Hi,

Please review the following small patch to avoid adding a trailing comma 
in the tagset and level listings in the configuration string for log 
outputs. Removing this comma allows the string to be used without 
modification when configuring logging (with -Xlog or similar).

Webrev:
http://cr.openjdk.java.net/~mlarsson/8153174/webrev.00/

Issue:
https://bugs.openjdk.java.net/browse/JDK-8153174

Thanks,
Marcus