Add a script to wait for packaging to complete

During the release process there's a step where the release engineer
needs to wait for packaging to complete. This uses the existing ci-jobs
functionality to poll a job.

This allows a release engineer to script things further, like:

    ./wait-packaging && ./download_rpms

wait-packaging

@@ -0,0 +1,12 @@
+#!/bin/bash -e
+
+. settings
+
+if [[ $PROJECT == pulpcore ]] ; then
+	./ci-jobs poll "pulpcore-packaging-rpm-${VERSION}-release"
+else
+	./ci-jobs poll "foreman-packaging-deb-${FOREMAN_VERSION}-release" &
+	./ci-jobs poll "foreman-packaging-rpm-${FOREMAN_VERSION}-release" &
+
+	wait
+fi