Read access on slave assets

[Michiel.Schok]

A [get] mediafile/{id}/acl call for a slaved asset fails.

I think it's fair to have 'read permission' on the ACL that's set for a slave record.
If any other datafields are 'forbidden' to read as 'app_admin' in a master/slave situation, I think they need an update too.

[post] calls may fail obviously.

[MC-arjen]

review request

[Michiel.Schok]

Allright.
From app-id 5 I did an acl call on an app-id 3 mediafile:

<?xml version="1.0"?>
<response>
  <header>
    <item_count>6</item_count>
    <request_process_time>0.0166</request_process_time>
    <request_query_count>18</request_query_count>
    <request_result>success</request_result>
    <request_result_description></request_result_description>
    <request_result_id>601</request_result_id>
    <request_uri>[GET] mediafile/aW7CK8uHSCtfSSuLerHoigvz/acl?user_id=nibg-admin</request_uri>
    <vpx_version>1.7.0</vpx_version>
  </header>
  <items>
    <item id="1">
      <aut_realm>@teleblik.nl</aut_realm>
    </item>
    <item id="2">
      <aut_realm>@ACADEMIA.group</aut_realm>
    </item>
    <item id="3">
      <aut_domain>ACADEMIA.group</aut_domain>
    </item>
    <item id="4">
      <aut_app>4</aut_app>
    </item>
    <item id="5">
      <aut_app>5</aut_app>
    </item>
    <item id="6">
      <aut_app>104</aut_app>
    </item>
  </items>
</response>

Tested and accepted.