Report status to ipop-stat-server

Although we are in the stage of refactoring the controller code, this commit is simple. It periodically reports to the ipop-stat server the traffic information. At this point, it reports only local traffic information. We need to improve it alongside with ipop-stat to reports connection-type, connection period and etc. 


While I don't think it'll save any code in this case, I think urllib2 is generally preferred to httplib, as it's higher level; unless you need some functionality that urllib2 doesn't provide.

https://stackoverflow.com/questions/3290522/urllib2-and-json