Update urls for Delorean repo files

delorean.repo is now redirected from trunk.rdoproject.org to
buildlogs.centos.org [0]

[0] https://www.redhat.com/archives/rdo-list/2016-June/msg00206.html

Closes-Bug: 1595568

Change-Id: I650abc34d9cf0c00f9025bd2c62f1bf03fbd96b7