[Libosinfo] [osinfo-db PATCH] rhel: Add treeinfo info for 8.0, 7.6 and 7.5

[Cole Robinson]

On 12/14/2018 04:39 AM, Fabiano Fidêncio wrote:
> Although Red Hat doesn't provide any public URL for tree installation,
> they do use a .treeinfo internally that contains some data that may be
> useful to recognize the tree installer (even if it's only used
> internally).
> 
> Signed-off-by: Fabiano Fidêncio <fidencio at redhat.com>

Reviewed-by: Cole Robinson <crobinso at redhat.com>

- Cole