changed repo to tested, shouldn't happen again.
Please reopen if you see it again.

I think this can also be because we're not blocking outside repos in the VMs any more.

We probably need to go back to doing that, or implement Lago issue #426 to allow injecting the mirrors from the reposync-config.conf file in to the VMs

We still used the old snapshot repo, I changed it to tested:
https://gerrit.ovirt.org/73093

Once this patch passes CI, I'll merge it and hopefully it should solve any missing RPMs from the snapshot repo.

You should look in the logs that are being archived in the build main page [1]
*DEBUG util.py:435: No Presto metadata available for centos-updates-el7
DEBUG util.py:435: http://resources.ovirt.org/pub/ovirt-master-snapshot/rpm/el7/x86_64/python-ovirt-engine-sdk4-4.2.0-0.a0.20170220gita7305aa.el7.centos.x86_64.rpm: [Errno 14] curl#5 - "Could not resolve proxy: proxy01.phx.ovirt.org"
DEBUG util.py:435: Trying other mirror.
DEBUG util.py:435: Error downloading packages:
DEBUG util.py:435: python-ovirt-engine-sdk4-4.2.0-0.a0.20170220gita7305aa.el7.centos.x86_64: [Errno 256] No more mirrors to try.
DEBUG util.py:573: Child return code was: 1*

Looks like a centos mirrors issue

[1] http://jenkins.ovirt.org/job/ovirt-system-tests_master_check-patch-el7-x86_64/197/artifact/exported-artifacts/mock_logs/mocker-epel-7-x86_64.el7.init/root.log