forgetest: the gate test leaves the step lists to forgectrl's setup_test

setup.gate-blocks-controllers asserted on the machine which steps the
image's table requires (GET /wiz's missing list) and recommends (each
not run yet, never the gate's parts or the optional steps). Both are
the setup table's decisions over a record, software with no hardware in
them, and forgectrl's setup_test now proves both on the image's own
table: the required steps in order (10b), the missing list emptying
when they are done (4b), and the recommended steps in order, each not
run yet (10b). The catalog keeps what needs the machine: the supervisor
holding and spawning the controller, the process, and the Grbl port.

- The two missing-list checks and the recommended-list check leave the
  test's body; its description says where they are proven.
- RECOMMENDED_STEPS and NEVER_RECOMMENDED go with them (no test read
  them any more), and the meta-test case that only compared them.

Proof: the forgetest host suite passes under Linux (test_setup_suite
with the case removed among it); the coverage lint is unchanged.

Acceptance: every setup.py test (the constants were the module's shared
text), setup.gate-blocks-controllers among them.

forgetest/tests/test_setup_suite.py

@@ -76,13 +76,7 @@ class RegistrationTests(unittest.TestCase):
                                                 "laser.focus": "the tray was replaced",
                                                 "airflow": "not run yet"})
 
-    def test_the_gate_parts_and_the_optional_steps_are_never_recommended(self):
-        self.assertFalse(set(setup.RECOMMENDED_STEPS) & set(setup.NEVER_RECOMMENDED))
-        self.assertFalse(set(setup.RECOMMENDED_STEPS) & set(setup.REQUIRED_STEPS))
-        for wid in ("advisories", "account", "airflow.intakes", "laser.floor", "motion.envelope"):
-            self.assertIn(wid, setup.NEVER_RECOMMENDED)
-        for wid in ("lens.travel", "laser.focus", "airflow", "switches"):
-            self.assertIn(wid, setup.RECOMMENDED_STEPS)
+    def test_the_form_wizards_and_the_required_steps(self):
         self.assertEqual(setup.FORM_WIZARDS, ("advisories", "account", "preferences", "machine", "cloud"))
         # in the order the gate's reason names them
         self.assertEqual(setup.REQUIRED_FORM_STEPS, ("preferences", "machine", "cloud"))