Clean up SENDMAILDEBUG in test case.

Author: rouilj

test/test_cgi.py

@@ -1641,6 +1641,9 @@ def testRegisterActionUnusedUserCheck(self):
                                nodeid=None, userid='2')
         self.assertRaises(Redirect, actions.RegisterAction(cl).handle)
 
+        # clean up from email log
+        if os.path.exists(SENDMAILDEBUG):
+            os.remove(SENDMAILDEBUG)
 
     def testserve_static_files(self):
         # make a client instance