[PATCH] JMC-5706 JavaBlockingRule should report block times

[Jessye Coleman Shapiro]

Hello,

This patch addresses JMC-5706: JavaBlockingRule should report block times
[0].  I have added the total time a top blocking monitor was blocked on to
the information reported.

I have also edited the 'groupedByThread' list filter condition to ensure
that only 'JavaMonitorEnter' events are being considered when determining
the 'mostBlockedThread'.   Without the filter I was getting a null pointer
exception, as the most common thread has not necessarily been blocked and
therefore may not have a blocking time associated with it - let me know if
this is not the case.

See the attached patch bellow and let me know what you think.

Thank you!

Jessye

[0] https://bugs.openjdk.java.net/browse/JMC-5706
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