This makes tox use the latest version of the tool from os-testr repo,
which contains some valuable changes, like the one making the gate
fail if for some reason no tests are executed because all of them are
skipped.
Change-Id: If88be4b310d746ccc885e3d0c1db8a4dfabb2a28
Correct some misspell words.
Such as:happend,adddress,represted,vavule,Prefered,proccesed.
Change-Id: I71209d67fec6f27ed2909b211bc4060ca0ba3181
Closes-Bug: #1591660
Ihar Hrachyshka