Topology not cleared using mininet of13/of10 simulation

Hello,

Topology fails with controller(of13) using both OF13 & OF10 mininet simulation

Steps can be reproduced easily:

Download the latest controller form integration repo.

1. Start the controller : ./run.sh -of13 -Xmx1G -start
2. Start the mininet(of10): sudo mn --controller 'remote,ip=127.0.0.1,port=6633' --topo tree,2
3. GET http://localhost:8080/controller/nb/v2/topology/default

and the response is
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<topology/>

4. Start the mininet(of13): sudo mn --topo tree,2 --controller 'remote,ip=127.0.0.1,port=6633' --switch ovsk,protocols=OpenFlow13

5. GET http://localhost:8080/controller/nb/v2/topology/default

and the response is
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<topology/>

Because of this topology behavior, the other testcases are getting failed.

Thanks,
Madhusudhan