remove whant now appears to be obsolete DCPS whitelisting (#34)

sros2/api/__init__.py

@@ -403,13 +403,7 @@ def create_permission_file(path, name, domain_id, permissions_dict):
         </%s>
 """ % (pubsubtag, partition_string, topics_string, pubsubtag)
 
-    # DCPS* is necessary for builtin data readers
     permission_str += """\
-        <subscribe>
-          <topics>
-            <topic>DCPS*</topic>
-          </topics>
-        </subscribe>
       </allow_rule>
       <default>DENY</default>
     </grant>