can't delete docker-type buildconfigs if docker strategy permission is removed

[bparees]

Create a docker type buildconfig

then (w/o running any builds), remove docker strategy permission from your user:
https://github.com/openshift/openshift-docs/pull/1909/files

then attempt to oc delete the buildconfig.

it will fail with:

Error from server: buildconfigs "ruby-hello-world" is forbidden: build strategy Docker is not allowed

This is because the reaper is attempting to first update the buildconfig to "paused" and the update is not permitted when you don't have docker buildconfig permissions.

The reaper should be slightly smarter: check if there are any builds to delete. If there are no builds to delete, don't bother to pause the buildconfig, just let it get deleted.