Devops documentation cleanup

Depends on:
    https://review.openstack.org/#/c/87487/
    https://review.openstack.org/#/c/87462/
    https://review.openstack.org/#/c/87117/

Change-Id: I9b363da4066a469a9b646c4de482dcad432f5977
Merge "Devops documentation cleanup"