beta: rename {/mnt,/data/project}/upload7

Some instances do not have /mnt/upload7 for some reason. Seems like the
puppet manifests have been broken somehow for beta. Instead of
attempting to figure out the issue in puppet, simply update the paths in
beta and thus replace:

 /mnt/upload7

By:

  /data/project/upload7

bug: 58202
Change-Id: I31275030f554f6bc55e2eb180333ea2760c1c666