Reorganize compute docs
Reorganize compute docs

This change organizes the compute docs by topic rather than letting
autodoc organize methods by the order they appear in the _proxy.py file.

Change-Id: Ie4955223a07c5ddbf0c5a06330521c69063bde28

stackforge/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk,briancurtin/python-openstacksdk,dtroyer/python-openstacksdk,briancurtin/python-openstacksdk,stackforge/python-openstacksdk