Create ACL for new user group: pdb-reader

[brindakv]

pdb-reader should be able to read data related to entries set to HOLD and REL.

The globus user-group exists: https://app.globus.org/groups/8875a770-3c40-11e9-a8c8-0ee7d80087ee/about

ACL needs to be set for this user-group.

[hongsudt]

I am giving pdb-readers read access to all the catalog (same as curators). @brindakv It will be deployed on dev at the end of today.