Remove unneeded use of task.release_resources()

There's no need to call release_resources() as it will be done in
TaskManger's __exit__ method.

Change-Id: Ie532d4b1dc0a7bdde37a75bfa7fb9e665428faa0

ironic/conductor/manager.py

@@ -1659,7 +1659,6 @@ class ConductorManager(base_manager.BaseConductorManager):
                 op = _('enabled') if enabled else _('disabled')
                 LOG.info(_LI("No console action was triggered because the "
                              "console is already %s"), op)
-                task.release_resources()
             else:
                 node.last_error = None
                 node.save()