Add update groups types API endpoint to volumes v3 library

This PS adds update group types API to v3 ``group_types_client``
library; min_microversion of this API is 3.11 [0].

Included in this PS:

* Update group types API to group_types_client
* Unit tests for update API
* API test for update API

[0] https://docs.openstack.org/cinder/latest/contributor/api_microversion_history.html#id11

Change-Id: Ie3834c1a4b3ebd1463cdaacc86cd21b7be9fa3ce
4 files changed