Update compatibility report generator to ignore o.a.h.hbase.shaded packages

This is a small change that will make reviewing release candidates a little easier. Right now that compatibility report includes classes that we shade. So when we shaded upgrade 3rd party dependencies, they show up in this report as an incompatible change. Changes to these classes do not affect users so there's no reason to consider them wrt compatibility. We should update the reporting tool to exclude this package.

For example, https://dist.apache.org/repos/dist/dev/hbase/2.6.0RC4/api_compare_2.5.0_to_2.6.0RC4.html#Binary_Removed