[log4j] com.lmax.disruptor.collections.Histogram gone in LMAX 3.4.x

[Gary Gregory]

Hi All:

It looks like LMAX removed com.lmax.disruptor.collections.Histogram in the
current 3.4.x.

We will have to copy it into our test code base if we want to keep using it
and keep up with LMAX versions.

Gary