tox: fix coverage

'tox -e cover' was broken as 'coverage' was looking for
'kuryr-kubernetes' package instead of 'kuryr_kubernetes'.

Change-Id: I3c52e5ce8b5e2fdad385a2edf16f9dc35f9286cd

.coveragerc

@@ -0,0 +1,17 @@
+[run]
+branch = True
+source = kuryr_kubernetes
+omit = kuryr_kubernetes/tests/*
+
+
+[report]
+ignore_errors = True
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if __name__ == .__main__.:

.gitignore

@@ -22,6 +22,7 @@ pip-log.txt
 
 # Unit test / coverage reports
 nosetests.xml
+cover
 
 # Translations
 *.mo

tox.ini

@@ -40,7 +40,8 @@ commands = {posargs}
 
 [testenv:cover]
 commands =
-  python setup.py testr --coverage --testr-args='{posargs}'
+  python setup.py test --coverage --testr-args='{posargs}' \
+    --coverage-package-name=kuryr_kubernetes
   coverage report
 
 [testenv:docs]