Use least privilege model between Gluu and Couchbase

[moabu]

Is your feature request related to a problem? Please describe.

The user should have only the Roles necessary for Gluu to operate correctly after installation.

In addition use of the admin user for normal operations floods Couchbase audit logs. Although Couchbase auditing can exclude specified users the admin user can not be excluded. It is required to have auditing for all team member user access but not for service user access. By using the "admin" user for service access auditing cannot be configured.

Describe the solution you'd like

• Create the superuser as already done
• Create another user named gluu specified with only the permissions needed to interact with Couchbase.

Permission list :

• query_select
• query_update
• query_insert
• query_delete

Possible permissions needed:

• data_reader
• data_writer