Test RHEL repositories daily in Travis
Every now and then users report issues which are specific to RHEL content but currently we are testing only CentOS and Fedora. We also need to test certificates, see #6735.
Get a test cert for CDN and configure it in Travis, see https://pulp.plan.io/issues/6735#How-to-add-these-tests.
Add tests to sync and publish the latest RHEL6, RHEL7 and RHEL8 (BaseOS and AppStream) repos. Those tests should run daily.
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