Remove sphinx_config.init_values() manual call
Remove sphinx_config.init_values() manual call

The function signature for Sphinx's config.init_values() changed since
version 1.3. That leads to:

TypeError: init_values() takes exactly 2 arguments (1 given)

But the function is already correctly called from
application.Sphinx()'s constructor. So use the configuration object
from the application instead of creating an own config object.

Change-Id: I343c26560bfe5116d5348b50b1890b3442ed845a
Closes-Bug: #1379998

JioCloud/pbr,klmitch/pbr,klmitch/pbr,openstack-dev/pbr,WiFast/pbr,openstack-dev/pbr,WiFast/pbr,varunarya10/pbr,openstack-dev/pbr,varunarya10/pbr,JioCloud/pbr