SUT statistics (broker related)

[michalxo]

It would make sense to gather various statistics about broker. For example:

• -XX:+PrintGCApplicationStoppedTime
• -XX:+PrintGCTimeStamps
• -Xloggc:gc.log

Also, broker should be started by default with -XX:+HeapDumpOnOutOfMemoryError

[orpiske]

I talked @michalxo and the metrics and he also needs the GC cycle count.

Tentatively adding this for 1.6. I will do it sooner if I can.