- Changed media name: yang.collection+xml/yang to application-collection+xml/json

- Modified ietf-netconf-list-pagination.yang:
     - changed get-pagable ->  get-pageable
     - renamed count -> limit
     - renamed skip -> offset
     - added import ietf-yang-metadata
     - added md:annotation remaining

apps/restconf/restconf_methods_get.c

@@ -507,6 +507,7 @@ api_data_collection(clicon_handle  h,
 	goto done;
     if (restconf_reply_send(req, 200, cbx, 0 /* XXX head */) < 0)
 	goto done;
+    cbx = NULL; /* is consumed by above */
  ok:
     retval = 0;
  done: