Update to refactor basic statistics helper functions to be accessible to host-side tests.

This is a precursor to host-side power tests which will use these helper functions.
There should be no code changes other then moving existing code out of one class and into another
that is more commonly accessible.
Added an additional dependency in ont file to account for change
Change-Id: I0feefcc181ad21a0f11965953754167514539f00