generate-openshift-repo: make atomic-openshift repo

This queries a repo file from a well known location for signed
`atomic-openshift` RPMs and drops a truncated version in the current
directory. (It drops the debug and source RPM portion of the repo)

generate-openshift-repo

@@ -3,10 +3,14 @@
 set -xeuo pipefail
 
 LATEST_OPENSHIFT_REPO=`curl https://storage.googleapis.com/origin-ci-test/releases/openshift/origin/master/.latest-rpms`
+LATEST_ATOMIC_OPENSHIFT_REPO='http://download-node-02.eng.bos.redhat.com/rcm-guest/puddles/RHAOS/AtomicOpenShift/4.0/latest/puddle.repo'
 
 echo "[openshift]
 name=openshift
 baseurl=${LATEST_OPENSHIFT_REPO}
 type=rpm
 enabled=1
 gpgcheck=0" > openshift.repo
+
+curl -L -s "${LATEST_ATOMIC_OPENSHIFT_REPO}" | head -n 5 > atomic-openshift.repo
+sed -i "1s|.*|[atomic-openshift]|" atomic-openshift.repo