Domain Admin Permissions are cached without permissions

[tpokorra]

we have had a test case with a domain admin, that was not able to add users. only read on domain.

lib/api/kolab_api_service_user.php, function capabilities:

should have been:

[ERROR] rights: Array
(
    [add] => w
    [delete] => w
    [edit] => w
    [info] => r
    [find] => r
    [userreport] => r
    [adminreport] => r
    [effective_rights] => r
)

but was:

[ERROR] rights: Array
(
    [info] => r
    [find] => r
    [userreport] => r
    [adminreport] => r
    [effective_rights] => r
)

see caching in lib/Auth/LDAP.php, function effective_rights

[tpokorra]

I have noted this already in #67 (comment)