alternate coverage config to check template coverage

E.g. using https://github.com/MrSenko/coverage-jinja-plugin

.coveragerc3.jinja

@@ -0,0 +1,24 @@
+[run]
+data_file = .coverage3
+plugins =
+    jinja_coverage
+
+omit =
+    setup.py
+    /usr/*
+    /tmp/*
+    tests/*
+    devtools/*
+    .tox/*
+
+[report]
+exclude_lines =
+    pragma: no cover
+    no cover 3.x
+    if six.PY2
+
+[html]
+directory = htmlcov/py3
+
+[jinja_coverage]
+template_directory = /home/mikem/Devel/koji/koji/www/kojiweb/templates