[SAC] /osgeo/download on osgeo6

Regina can correct if I'm mis-remembering. Back before we containerized
osgeo download, in order to get it more space we NFS mounted space from
osgeo6 the the osgeo3 download virtual machine.

So this is probably safe to remove, You can always double check that the
current contents are actually served from the download container (on
osgeo7?)

Correct the whole download container is holding the full download folder.
We are not using any mounted drives anymore since we have enough space with
the new setup.
It's capped at 2 TB.

Probably best to ask J├╝rgen Fischer though as I think he was the one to set
it up. I know he still had some rsync mirroring going on, but I think that
might be to osgeo5 (backup server).

Thanks,
Regina