Impacted versions: 8-11

## Current behavior:

If during an XMLRPC call you try to get anything from `http.request`, you'd get a `RuntimeError` such as this one:

```
Traceback (most recent call last):
  File "/opt/odoo/custom/src/odoo/odoo/service/wsgi_server.py", line 56, in xmlrpc_return
    result = odoo.http.dispatch_rpc(service, method, params)
  File "/opt/odoo/custom/src/odoo/odoo/http.py", line 118, in dispatch_rpc
    result = dispatch(method, params)
  File "/opt/odoo/custom/src/odoo/odoo/service/common.py", line 57, in dispatch
    return g[exp_method_name](*params)
  [...]
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 343, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 302, in _get_current_object
    return self.__local()
  File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 135, in _lookup
    raise RuntimeError(\'object unbound\')
RuntimeError: object unbound
```

This renders imposible in practice to fix issues such as https://github.com/OCA/server-tools/issues/1125 or to implement https://github.com/odoo/odoo/pull/22212#issuecomment-380425764.

## Expected behavior:

XML-RPC calls should have request, since after all they belong to one. Otherwise, at least there should be an alternate way to access the request parameters.

Fix for v12: https://github.com/odoo/odoo/pull/24187

@Tecnativa
odoo/http.py
if isinstance(result, Response) and result.is_qweb:
            try:
                result.flatten()
            except Exception as e:
                if request.db:
                    result = request.registry['ir.http']._handle_exception(e)
                else:
                    raise
        if isinstance(result, (bytes, pycompat.text_type)):
            response = Response(result, mimetype='text/html')
        else:
            response = result
        if httprequest.session.should_save:
            if httprequest.session.rotate:
                self.session_store.delete(httprequest.session)
                httprequest.session.sid = self.session_store.generate_key()
                httprequest.session.modified = True
            self.session_store.save(httprequest.session)
        
        
        
        
        
        
        if not explicit_session and hasattr(response, 'set_cookie'):
            response.set_cookie(
                'session_id', httprequest.session.sid, max_age=90 * 24 * 60 * 60, httponly=True)
        return response
    def dispatch(self, environ, start_response):