8e34aece1a
Use ostestr as runner instead of the custome pretty_tox.sh script (pretty much removed everywhere). pretty_tox3.sh is just a wrapper for ostestr but it could be probably removed as well going forward. Also remove the tempest-lib dependency, which originally provided subunit-trace (now from os-testr). Change-Id: I4390964ce83167d634b80f696e82a0e199582ce6