forgetest: the coolant flow calibration is a required step; the gate's missing list

forgectrl requires cooling.flow after preferences, machine, and cloud,
and GET /wiz lists the required steps the gate waits for as missing.

- REQUIRED_STEPS is the form steps plus cooling.flow, in the gate's
  order; REQUIRED_FORM_STEPS are the form steps. cooling.flow leaves
  RECOMMENDED_STEPS.
- setup.gate-blocks-controllers expects "setup required: preferences,
  machine, cloud, cooling.flow" on a record with no step done, with all
  four named in missing, and an empty missing list once they are done
  and the gate is open.
- setup.first-run-flow walks the form steps alone: its seed keeps the
  checks done, the calibration among them, so the gate's reason
  narrows from the three form steps to open.

Proof: the setup host tests (74) and the manifest tests pass; the host
test of record_with_required_steps keeps the four.

Acceptance: these are the tests.

forgetest/tests/test_setup_suite.py

@@ -85,7 +85,9 @@ class RegistrationTests(unittest.TestCase):
             self.assertIn(wid, setup.RECOMMENDED_STEPS)
         self.assertEqual(setup.FORM_WIZARDS, ("advisories", "account", "preferences", "machine", "cloud"))
         # in the order the gate's reason names them
-        self.assertEqual(setup.REQUIRED_STEPS, ("preferences", "machine", "cloud"))
+        self.assertEqual(setup.REQUIRED_FORM_STEPS, ("preferences", "machine", "cloud"))
+        self.assertEqual(setup.REQUIRED_STEPS, ("preferences", "machine", "cloud", "cooling.flow"))
+        self.assertIn("cooling.flow", setup.REQUIRED_STEPS)
 
     def test_the_gate_test_starts_from_an_open_gate_and_the_intake_tests_from_a_count(self):
         reg = self.reg
@@ -191,9 +193,10 @@ class RecordTests(unittest.TestCase):
         rec["wizards"]["switches"] = {"version": 1}
         rec["flags"] = {"machine": {"reason": "the head was replaced"}}
         out = setup.record_with_required_steps(rec)
-        self.assertEqual(sorted(out["wizards"]), ["cloud", "machine", "preferences"])
+        self.assertEqual(sorted(out["wizards"]), ["cloud", "cooling.flow", "machine", "preferences"])
         self.assertEqual(out["wizards"]["machine"]["result"], {"model": "basic"})     # kept from the record
         self.assertEqual(out["wizards"]["preferences"]["version"], 1)               # written at version 1
+        self.assertEqual(out["wizards"]["cooling.flow"]["version"], 1)
         self.assertEqual(out["flags"], {})
         self.assertEqual(out["account"], rec["account"])
         self.assertIn("switches", rec["wizards"])                                   # a copy