Remove redundant unit suffix

Transfer speed already has a "MB/s" unit. The "s" suffix was probably a
copy/paste mistake.

Change-Id: Iccd7894d5ca11aac8a9f98365834c5d3deef0720
Added support for running the tests under PyPy with tox

This is a precursor to having them run under check and gate.

Change-Id: Ia512b68b5b47a88d5f7c1015cdf7151c322d293d
Merge "Added support for running the tests under PyPy with tox"