Verify the integration between OSRM and Telenav Traffic service about osrm-backend

[wangyoucao577]

For verify whether traffic update is successful for each iteration,

• Idea 1: test it by something like heartbeat(request)
  We may not easy to test it by heartbeat since the traffic data will be customizing into OSRM files. We don't have switch to enable/disable traffic after osrm-routed load data into memory. The only way to do it is send a lot of requests against both old and new container to see whether some of them are different. Obviously it's too inefficiency if we do it for each iteration.

• Idea 2: refer to #22, there're some logs by osrm-customize will show totally how many new traffics we have(6727490values) and how many new traffics the osrm-customize used(Used 0 speeds):

[info] Loaded /Users/xunliu/Desktop/data/us_nv/traffic.csv with 6727490values
...
[info] Used 0 speeds from /Users/xunliu/Desktop/data/us_nv/traffic.csv

• Proposal Solutions for Idea 2
  1. I think we can add a threshold to tell osrm-customize to stop if the used / total <= threshold. E.g. used / total <= 80%, then the osrm-customize will exit and return fail. The threshold can be added to osrm-customize as a command line flag, so that we can adjust easily to suitable for different data/traffic set. (MY PREFER)
  2. Another way is to realtime analyze log of osrm-customize, stop it once find the used / total too small. The advantage is we don't need to modify codes of osrm-customize.