Changes

job.yaml: fix apiVersion and other tweaks

The API version for templates is now `template.openshift.io/v1`.
Possibly `v1` was accepted before but not anymore? Fix it.

While we're here, tweak the template name to make it clearer that the
template itself is never created as an object.

Also remove the parameter default value to hard require clients to
always specify it.

buildconfig.json: fix apiVersion

The API version for templates is now `template.openshift.io/v1`.
Possibly `v1` was accepted before but not anymore? Fix it.

Missed doing this as part of badbfa0 ("job.yaml: fix apiVersion and
other tweaks").