Deprecate unused config option

The 'cluster_event_check_interval' config option is no longer used
and is now deprecated.

Change-Id: If5b1f7338ed549a36d1c5afc33c707ad98a6b43a

compute_hyperv/nova/conf.py

@@ -23,6 +23,8 @@ hyperv_opts = [
                help='Number of seconds to wait for an instance to be '
                     'evacuated during host maintenance.'),
     cfg.IntOpt('cluster_event_check_interval',
+               deprecated_for_removal=True,
+               deprecated_since="5.0.1",
                default=2),
     cfg.BoolOpt('instance_automatic_shutdown',
                 default=False,