Display scopes while GETTING domain quotas

Description

The quota of a user is defined as follow:

• If a quota is defined at the user level use it
• Else, rely on the domain level quota
• Else, rely on the global level quota

To be noted that count and size quota are resolved independently.

Hence, the quota applicable by default to a domain is defined by the *global* and *domain* scopes. However, from the domain quota endpoint, this information can not be retrieved.

Note that OpenPaaS ADMIN needs consolidated information for this a part of https://ci.linagora.com/linagora/lgs/openpaas/linagora.esn.admin/issues/438

Expected result

We should return:

{
 "global": {"count":52,"size":42}
 "domain": {"count":25,"size":142}
 "computed": {"count":25,"size":142}
}

That would be consistant with user's `curl -XGET http://ip:port/quota/users/usernameToBeUsed`

Current behaviour

We return only:

{"count":25,"size":142}