Reduce queries to groups custom data during login

When Artifactory requests a bulk of groups for a user (during authentication), currently Access would send a query to the groups custom data table for each group in the result set. Prior to access-user-management, Artifactory wouldn't need to query for custom data as the two tables were just one, so now, a user that belongs to 1k groups would entail 1k queries, whereas before we only had to do 1 query.