Stress tests to explore the 3.8 sync slowdown issue

A couple of tests that I wrote to help figure out why in some cases
sync is slower in 3.8 than in 3.4

BUG=chromium:240411
TEST=run crdel and usync on client

Change-Id: Ia633552297ad6ca9e68e6db4dd51a8e832f8e8b9
Reviewed-on: https://gerrit.chromium.org/gerrit/59489
Commit-Queue: Paul Taysom <taysom@chromium.org>
Reviewed-by: Paul Taysom <taysom@chromium.org>
Tested-by: Paul Taysom <taysom@chromium.org>
6 files changed