Updated openstack/openstack
Project: openstack/oslo.concurrency  5de5c42b1f26a0dbc6e63205a88020e9b5592ce1

Workflow documentation is now in infra-manual

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

Change-Id: Iae073e56006cc04fb852cef0425cbade533e8cae