SAK-25862 Set default permissions for signup tool when upgrade script is run.

This sets up the default permissions for signup tool on existing DBs. It doesn't grant any of the optional permissions listed on the signup setup page.

git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@307331 66ffb92e-73f9-0310-93c1-f5514f145a0a