cleanup temporary key file

src/mod_sso/test/httpd_integration_test.py

@@ -43,6 +43,10 @@ def _stop_httpd(httpd):
         os.remove("test-httpd.pid")
     except OSError:
         pass
+    try:
+        os.remove("public.key")
+    except OSError:
+        pass
 
 
 def _query(url, host=None, cookie=None):