JEP 271: Unified GC Logging - Third pre-review

[Bengt Rutisson]

Hi everyone,

Here is an updated pre-review for the work for JEP 271 Unified GC Logging.

Now it includes all the logging that I plan on converting for the first 
step.

Here are examples from the latest prototype:
http://cr.openjdk.java.net/~brutisso/JEP-271/pre-review.02/compare.html

The webrev for the changes is available here:
http://cr.openjdk.java.net/~brutisso/JEP-271/pre-review.02/webrev.02/

Some changes that have been made:

- GC id is now logged as "GC(5)" instead of the previous "GC#5"
- The CMS and G1 concurrent logging have been homogenized to look 
similar. All concurrent phases are start with "Concurrent" and now 
include timestamps.
- The paused phases now all start with "Pause".
- The log messages from the different collectors now look more similar. 
For example "Pause Young" is used for young GCs for all collectors 
instead of for example "Young pause" for G1 and "Pause. ParNew" for CMS.
- I've added a line at the start of the log to clearly state what GC is 
selected.

Thanks,
Bengt