Revert "Pause ubuntu-xenial image uploads"
Revert "Pause ubuntu-xenial image uploads"

Enable uploads again, now that DIBs are fixed.

This reverts commit 3735c8eeb5c5cdbc7c016df165432dccc312aadc.

Change-Id: I4db83ecc7892da934a1e3910e9941818caa0dfe3
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

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