Openflow Stats not getting updated

This a missing functionality to the bug
https://bugs.opendaylight.org/show_bug.cgi?id=2435

I am polling the two switches for the aggregate flow statistics every 30 seconds using REST on the controller. However the statistics never get updated and always remain at 0.

On reviewing the file and further investigation with Vaclav's help, code does not check for existing queue in statistics and no queues are created from statQueue response.

----------Comment from Vaclav

<v_demcak1> Ok ... I've compared your log with implementation ... and I've found the problem ... it's finally bug and needs to be fixed - we are missing a check for existing queue in statistics but this is a way for create so we have to create new Queue from statQueue response