Pass kwargs from EventletHTTPTransport to super class

This makes Eventlet transport support configurable timeout (and possibly some other transport parameters).

Without this patch it fails with

```
Traceback (most recent call last):
...
    self._transports[full_url] = self._schemes[parsed_url.scheme](parsed_url, **options)
TypeError: __init__() got an unexpected keyword argument 'timeout'
```