ea4224 Add support for CentOS Stream 8 repos

Authored and Committed by sbonazzo 3 years ago
    Add support for CentOS Stream 8 repos
    
    This patch makes that CentOS Stream 8 systems use repositories under
    8-stream in Virt SIG instead of 8 ones.
    
    Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>