test: Disable broken repositories for rhel-7 images.
test: Disable broken repositories for rhel-7 images.

A better fix would be to use virt-builder instead of the magic base
images.

Closes #2642
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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