Updated openstack/openstack
Project: openstack-dev/pbr  49ff27c13e4dd1817ee589a801bb7cfbf9cedbbf

Workflow documentation is now in infra-manual

Replace URLs for workflow documentation to appropriate parts of the
OpenStack Project Infrastructure Manual.

Change-Id: Idd9d4e59ccd3af51364e79df7fd67e6cb3c8689c