Fix review request counters when reassigning ownership.

Review Request #417 - Created Feb. 20, 2017 and submitted

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/

  
guest8904
Review request changed

Status: Closed (submitted)

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