* Major rewrite of event streams

* If you used old event callbacks API, you need to switch to the streams API
    * See clixon_stream.[ch]
  * Old streams API which needs to be removed include:
    * clicon_log_register_callback()
    * subscription_add() --> stream_register()
    * backend_notify() and backend_notify_xml() - use stream_notify() instead
* Example uses "NETCONF" stream instead of "ROUTING"
* Added timeout option -t for clixon_netconf - quit after max time.

datastore/text/clixon_xmldb_text.c

@@ -892,7 +892,7 @@ text_put(xmldb_handle        xh,
 	}
 	cbretlocal++;
     }
-    if ((yspec =  th->th_yangspec) == NULL){
+    if ((yspec = th->th_yangspec) == NULL){
 	clicon_err(OE_YANG, ENOENT, "No yang spec");
 	goto done;
     }