02f44c9cf97bbf4792be0314208a699a0b1d6bf7
Gerrit currently runs git diff-tree to discover changed files.
That command might not be available in all environments, so I
replaced it with a Java based implementation.
The Java based implementation does not yet support whitespace
ignore, rename detection, or merge commits.
Change-Id: I0adfb7b68e7beba635176f1295c442ffdd397d4e
(cherry picked from commit 34f5af4c85)
Change-Id: Ib76aaad601c858399a58219fdf179a55bdaacf85
Description
RETIRED, Gerrit as used by OpenStack