Errata list for retired releases

Issue

It's not possible to select the errata that were available for RHEL6.8. It forces always the latest 6 release.
Also the old link that has 6.8 in it: https://access.redhat.com/downloads/content/69/ver=/rhel---6/6.8/x86_64/product-errata will include all RHEL6.9 errata.

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