Improving cover testenv

- Add coverage report to analyze code.

Change-Id: I46d3e6abe0a2b2e39db80ff399fcd53d35d1d577

tox.ini

@@ -41,7 +41,11 @@ commands = rm -rf doc/build
            sphinx-build -E -W -b html doc/source doc/build/html
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+commands =
+  coverage erase
+  find . -type f -name "*.pyc" -delete
+  python setup.py testr --coverage --testr-args='{posargs}'
+  coverage report
 
 [testenv:bandit]
 deps = -r{toxinidir}/test-requirements.txt