Periodically read the SID config file to update the status
Fixed the problem that if a node is down and up again, controller won't accept its LSA for a long time because its seq_num is reset to 0.
Added a script to start the distributed topology. Maybe it should be implemented inside xianet
Added sequence number of discovery packets
Change the behavior of controllers so that they calculate shortest paths more frequently when starting up.
Router can remove SID routing entry now by using a non-positive weight value
When disabling an SID, the controller will now actively tell other ADs to remove it.
Kill the subprocess if xwrap is being killed
Added back the original simple TCP/IP http client for testing
Simple http server will listen to a fixed port. Added some debug
message.
Added test scripts for turning on/off SID broadcasting and server intances. Added scripts for load test.