L2SS-811: Ignore test directories and correctly report coverage

Closes L2SS-811

tangostationcontrol/tox.ini

@@ -46,9 +46,9 @@ commands =
   {envpython} -m coverage erase
   {envpython} -m stestr run {posargs}
   {envpython} -m coverage combine
-  {envpython} -m coverage html -d cover
+  {envpython} -m coverage html --omit='*test*' -d cover
   {envpython} -m coverage xml -o coverage.xml
-  {envpython} -m coverage report
+  {envpython} -m coverage report --omit='*test*'
 
 ; TODO(Corne): Integrate Hacking to customize pep8 rules
 [testenv:pep8]