Revert "Add support for permissions specific to Local Sites."

This reverts commit 63a9f97a9600800e8c41bfd961361c14643f1671.

Accidentally committed this instead of another branch. Still waiting for
review.
Fix showing private review requests in a couple lists.

The submitters page and the group review requests page weren't factoring
in the viewing user, preventing private review requests from showing up
for that user. The queries for these pages now pass in the viewing user.