Fix review request counters when reassigning ownership.

Review Request #417 — Created Feb. 20, 2017 and submitted — Latest diff uploaded

guest8904
Review Board
abc032d...
demo
Reassigning review request ownership worked pretty well overall, but would
leave the review request counters untouched. This change fixes that, and adds a
unit test to verify the results.

Testing done:
- Manually reassigned a review request and saw the pending/total counters
  update correctly.
- Ran unit tests.

Reviewed at https://reviews.reviewboard.org/r/8757/


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