fiddlecli - Hopefully fix issues with hash mismatches.
fiddlecli - Hopefully fix issues with hash mismatches.

Finally got this issue to reproduce locally.

This change creates a new http client for every run and moves the serialization
of the request into the loop, none of which should have made a difference.

Also added a final check that all hashes match right before writing the results file.

Bug: skia:8151
Change-Id: Ifaa12af670ec961aacab5dcd1e1745b4a3682adc
Reviewed-on: https://skia-review.googlesource.com/142887
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot