Remove deprecated option [DEFAULT]enabled_drivers

The option was deprecated in Rocky, this patch removes it.

Change-Id: I6c1ef41b0f960fc2843a494dfd002a982e2bef01

ironic/conductor/base_manager.py

@@ -117,11 +117,6 @@ class BaseConductorManager(object):
             use_groups=self._use_groups())
         """Consistent hash ring which maps drivers to conductors."""
 
-        # TODO(dtantsur): remove in Stein
-        if CONF.enabled_drivers:
-            raise RuntimeError("The enabled_drivers configuration option "
-                               "no longer has any effect and must be empty")
-
         _check_enabled_interfaces()
 
         # NOTE(deva): these calls may raise DriverLoadError or DriverNotFound

ironic/conf/default.py

@@ -77,15 +77,6 @@ api_opts = [
 ]
 
 driver_opts = [
-    cfg.ListOpt('enabled_drivers',
-                default=[],
-                help=_('This option is left for a start up check only. '
-                       'Any non-empty value will prevent the conductor '
-                       'from starting.'),
-                deprecated_for_removal=True,
-                deprecated_reason=_('Hardware types should be used instead '
-                                    'of classic drivers. They are enabled '
-                                    'via the enabled_hardware_types option.')),
     cfg.ListOpt('enabled_hardware_types',
                 default=['ipmi'],
                 help=_('Specify the list of hardware types to load during '

releasenotes/notes/remove-enabled-drivers-5afcd77b53da1499.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The configuration option ``[DEFAULT]enabled_drivers`` is removed. The
+    option was deprecated in Rocky, and setting this option has raised an
+    exception preventing conductor from starting since then.
+    ``[DEFAULT]enabled_hardware_types`` should be used instead.