Updated openstack/openstack
Project: openstack/nova  ab05e2dda6d44afddbd9462bba15d185ebc63597

docs - Set pbr 'warnerrors' option for doc build

By setting this pbr option in setup.cfg, the doc build will fail in case
of any warnings or errors occur during the build process.

Closes-Bug: #1351350

Change-Id: Id4858062d2aaa4c2fe5b597e40e4e8947f544a4d