Fix test_zero_quarantine

Edge case of someone being asked to quarantine after having left
hospital after a very short day (hospital stay shorter then test turn
around)

Leave model behaviour to still ask them to quarantine, but fix test by
making tests instantaneous

Author: roberthinch

tests/test_ibm.py

@@ -191,6 +191,8 @@ def test_zero_quarantine(self):
         Test there are no individuals quarantined if all quarantine parameters are "turned off"
         """
         params = ParameterSet(constant.TEST_DATA_FILE, line_number = 1)
+        params.set_param("test_order_wait",0)
+        params.set_param("test_result_wait",0)
         params = utils.turn_off_quarantine(params)
         params.write_params(constant.TEST_DATA_FILE)