Add more detail to Bodhi's SOP regarding building and OpenShift.
    
    This commit adds more details about how to specify which version
    of Bodhi gets deployed to OpenShift, since we don't just build the
    latest version found in the infrastructure repository. It also
    describes how to build Bodhi for the f29-infra and f29-infra-stg
    repositories.
    
    Signed-off-by: Randy Barlow <randy@electronsweatshop.com>