[atlas] Time difference between results and update of measurement status

[Vasileios Giotsas]

I've seen that the status of a measurement is updated much later than when the 
measurement results become available.
For instance, while the RTTs of a ping measurement are returned the status is 
still Ongoing for up to 3 minutes.
Is there anything (such as sanity checks) that intervenes between the update of 
the results and and update of the measurement status, which may change the 
results?
Or is it safe to assume that once the results are out the measurement status 
will eventually change to 'Stopped', just a bit later?

Thanks!
Vasileios