API actions can not be versioned

[Valeriy Ponomaryov]

Manila has functionality of API versioning only for resources, but not actions with resources. So, it is impossible to make several versions of some action using same name of method or name of action as required by versioning functionality.

For the moment, versioning of actions can be achieved by usage of different names and methods for different versions. It is some kind of ugly when we have lots of them.

Another approach is having a single method, single action name, and check API version in request parameter to decide the method behavior.

[Clinton Knight (clintonk)]

This is a known issue, and the Nova author acknowledged it was intentional but ugly.

https://github.com/openstack/manila/blob/master/manila/api/openstack/wsgi.py#L977

It is an issue in Manila's admin actions module, where we had to pick non-overlapping names for the versioned methods.

[Rodrigo Barbieri (rodrigo-barbieri2010)]

Updated description stating that duplicated action names also do not work. As investigated by Valeriy and myself.

[TommyLike (hu-husheng)]

I think this no longer affect Cinder and Manila, tested in devstack both for both project, take manila for example:

```python
@wsgi.Controller.api_version('2.7', '2.21')
    @wsgi.action('reset_status')
    def share_reset_status(self, req, id, body):
        print('this is method one')
        return self._reset_status(req, id, body)

    @wsgi.Controller.api_version('2.22')
    @wsgi.action('reset_status')
    def share_reset_status(self, req, id, body):
        print('this is method two')
        return self._reset_status(req, id, body)

```

these method could be triggered by specifying different mircoversion:

```cmd
curl -i -X POST http://10.229.50.225:8786/v2/96bdd0edecc442a1b90454bb2ccfe31b/shares/1a3a0430-bc54-4bd2-a367-f851fe9b8347/action -H "X-Openstack-Manila-Api-Version: 2.22" -H "X-Auth-Token: d79a5605ebc049f78a85a145778b0632" -H "Content-Type: application/json" -H "Accept: application/json" -H "User-Agent: python-manilaclient" -d '{"reset_status": {"status": "error"}}'

```