Avoid imports in openstack/__init__.py
Avoid imports in openstack/__init__.py

These imports are creating problems when installing sdk. The problem
might be caused by new pbr logics. However, I think fixing them from
SDK side is much easier.

Change-Id: I2f028e383d790edd1c28dea74056b96e87fe285c
Related-Bug: #1672238

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