Update tests/system_test.py

Author: jiridanek

tests/system_test.py

@@ -513,6 +513,7 @@ def __init__(self, name=None, config=Config(), pyinclude=None, wait=True,
         elif env_home:
             args += ['-I', os.path.join(env_home, 'python')]
 
+        args = os.environ.get('QPID_DISPATCH_RUNNER', '').split() + args
         super(Qdrouterd, self).__init__(args, name=name, expect=expect)
         self._management = None
         self._wait_ready = False