ipalib.plugins: Expose LDAPObjects' eligibility for permission --type in JSON metadata

https://fedorahosted.org/freeipa/ticket/4201

Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipalib/plugins/baseldap.py

@@ -631,6 +631,8 @@ class LDAPObject(Object):
         json_dict['aciattrs'] = attrlist
         attrlist.sort()
         json_dict['methods'] = [m for m in self.methods]
+        json_dict['can_have_permissions'] = bool(
+            self.permission_filter_objectclasses)
         return json_dict