This updates the github source to only use the most recent review
from each user reviewing a PR. This avoids having obsolete negative
reviews trump a newer positive review.
I've added a new test for good measure to ensure it works for the
github case, where we are doing some conversion of github formatted
timestamps to internal timestamps.
Change-Id: I5607901def856c9363ec786a4116bfec19c9c97c
Co-Authored-By: Jesse Keating <omgjlk@us.ibm.com>
Signed-off-by: Adam Gandelman <adamg@ubuntu.com>
d81dd7646f