run_tests: use directory instead of python package format

Author: prauscher

tests/run_tests.py

@@ -26,4 +26,4 @@
 # Load models
 application = get_wsgi_application()
 
-management.call_command("test", "djangosaml2.tests", "testprofiles", "-v", "2")
+management.call_command("test", "djangosaml2/tests", "testprofiles", "-v", "2")