Coverage now uses stestr.

This brings coverage measuring in line with
the standard tox testing process.

Closes-bug: #1922726

Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I6bf27ffe88ff55b62e202678340a324058d30051

tox.ini

@@ -105,11 +105,16 @@ commands =
     sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
 [testenv:cover]
-deps =
-    -r {toxinidir}/requirements.txt
-    -r {toxinidir}/test-requirements.txt
-    -r {toxinidir}/molecule-requirements.txt
-commands = python setup.py test --coverage --testr-args='{posargs}'
+setenv =
+  PYTHON=coverage run --source tripleo_validations --parallel-mode --branch
+  HOME={envdir}
+commands =
+  coverage erase
+  stestr run {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
 
 [testenv:docs]
 deps =