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This change fixes a number of bugs in FidoBleTransaction and adds
corresponding tests. In particular, it fixes a race condition, where
the completion callback was run before the last write was acknowlegded.
In addition, it improves the robustness with regard to malformed input.

Bug: 880053
Change-Id: I81f6d5c02d01b9d7ea1a184a7236cd74d52f356d
Reviewed-on: https://chromium-review.googlesource.com/1224383
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592398}