tcp-to-blob logging improvement

[scschneider]

Currently we have the total end to end time from when a connection starts sending data to tcp-to-blob to when it is finished uploading. It would be good to have this broken down to separate tcp-to-blob receive time vs tcp-to-blob upload time.

[micholas]

Currently, we measure only the total time, durationInSeconds. Let's log 2 additional properties:

1. receiveDurationInSeconds
2. blobUploadDurationInSeconds
3. durationInSeconds: basically receiveDurationInSeconds + blobUploadDurationInSeconds