Disable deltarpms for fedora mirrors
Disable deltarpms for fedora mirrors

Until now, this wasn't an issue. However it seems fedora 25 started
looking for a drpm file today:

  [MIRROR] pcre-8.40-5.fc25_8.40-6.fc25.x86_64.drpm: Status code: 404 for
  http://mirror.iad.rax.openstack.org/fedora/updates/25/x86_64/drpms/pcre-8.40-5.fc25_8.40-6.fc25.x86_64.drpm

Because we don't mirror drpms (to save space) our fedora-25 nodes are
failing.  So, just disable drpms for our mirrors.

Change-Id: I35b2f3f638f4551d5f169d1d6e081f29377ccb85
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

openstack-infra/project-config,openstack-infra/project-config