Class Placement

[Daniel Templeton]

I'm working on an HDFS sink for metrics2 to allow daemons to log metrics 
into HDFS.  In order to test the new sink, I need access to the 
MiniDFSCluster, which I don't have from the common package, where the 
code for all the other metrics2 sinks lives.

Any objection to putting the unit test code in the HDFS project in the 
o.a.h.metrics2.sink package?

Thanks,
Daniel