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 len(args) > 2:
        args = list(args)
        args[2] = '*'
    return tuple(args)
NO_POSTMORTEM = (odoo.osv.orm.except_orm,
                 odoo.exceptions.AccessError,
                 odoo.exceptions.ValidationError,
                 odoo.exceptions.MissingError,
                 odoo.exceptions.AccessDenied,
                 odoo.exceptions.Warning,
                 odoo.exceptions.RedirectWarning)
def dispatch_rpc(service_name, method, params):
    """ Handle a RPC call.
    This is pure Python code, the actual marshalling (from/to XML-RPC) is done
    in a upper layer.
    """
    try:
        rpc_request_flag = rpc_request.isEnabledFor(logging.DEBUG)
        rpc_response_flag = rpc_response.isEnabledFor(logging.DEBUG)
        if rpc_request_flag or rpc_response_flag:
            start_time = time.time()
            start_rss, start_vms = 0, 0
            if psutil:
                start_rss, start_vms = memory_info(psutil.Process(os.getpid()))
            if rpc_request and rpc_response_flag:
                odoo.netsvc.log(rpc_request, logging.DEBUG, '%s.%s' % (service_name, method), replace_request_password(params))
        threading.current_thread().uid = None