Disable osc extension for 0.9.0 release
Disable osc extension for 0.9.0 release

In this patch osc extension is commented for releasing heatclient.
This patch will be used for tagging as 0.9.0.
Next patch in master should enable osc extension again.

Change-Id: Iaf74c264fb9d92a9fce9d5d19c48b54b88a40ad7

openstack/python-heatclient