address a race condition for state=started

If you tell supervisorctl to update and a process autostarts
sometimes you will get ERROR (already started) if you immediately
ensure the process is started afterwards.

playbooks/library/supervisorctl

@@ -184,6 +184,8 @@ def main():
 
         if '%s: started' % name in out:
             module.exit_json(changed=True, name=name, state=state)
+        elif '%s: ERROR (already started)' % name in out:
+            module.exit_json(changed=False, name=name, state=state)
 
         module.fail_json(msg=out)