RFR (S): 8142482: Improve the support for prefix functions in unified logging

[Marcus Larsson]

Hi,

Please review the following small patch to improve the support for 
prefixes in unified logging.

Instead of the previous format and value/callback, a prefix is now 
defined as a function that receives the log buffer as argument,
allowing it to fill in an arbitrary (or empty!) prefix. (This enables 
GCId-prefixing to be skipped when GCId is undefined, for example.)

Webrev:
http://cr.openjdk.java.net/~mlarsson/8142482/webrev.00/

Issue:
https://bugs.openjdk.java.net/browse/JDK-8142482

Thanks,
Marcus
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