Workflow documentation is now in infra-manual

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

Change-Id: Id09c9bdf8804c1ed90e49606e76ffbff1d96a7c2
Fix ec2 credentials commands for new auth

These commands were not updated for the new authentication model.

Closes-Bug: 1399757

Change-Id: I5d4beb9d1fa6914fef5e4c7b459cdd967e614b24
Merge "Workflow documentation is now in infra-manual"