Merge "Fix tox coverage test result filename"

Author: Zuul

tox.ini

@@ -71,7 +71,7 @@ commands =
   stestr run --no-subunit-trace {posargs}
   coverage combine
   coverage html -d cover
-  coverage xml -o cover/coverage.x
+  coverage xml -o cover/coverage.xml
   coverage report --fail-under=92 --skip-covered
 
 [testenv:docs]