[runtests] Clean up coverage report + add it to runtests.sh

runtests.sh now also reports coverage.

.coveragerc

@@ -1,3 +1,12 @@
 [run]
 omit =
 	tests/*
+	*mock*
+	*funcsigs*
+	*pbr*
+	*six*
+
+[report]
+	exclude_lines =
+		except ImportError:
+		pass

runtests.sh

@@ -1,11 +1,11 @@
 #!/bin/sh
 
 echo "testing with $(python2 -V 2>&1)"
-python2 $(which nosetests) --rednose -v tests/
+python2 $(which nosetests) --rednose -v --with-coverage --cover-erase tests/
 
 if [ $? == 0 ]; then
 	echo
 
 	echo "testing with $(python3 -V 2>&1)"
-	python3 $(which nosetests-3) --rednose -v tests/
+	python3 $(which nosetests-3) --rednose -v --with-coverage --cover-erase tests/
 fi