Autotest: Pyautoperf needs to copy keyvals from client-side.

When we switched from using a client-side only test PyautoPerfTests
to a server-side + client-side test, we lost the perf keyvals from
the client. These need to be copied from the client.

BUG=chromium-os:36519
TEST=Local run through run_remote_tests and ensured that the server-side
     results file now has the keyval file and that before the changes it
     did not.

Change-Id: Id67bab17d40531b1e1c8fb685df0913e2887e546
Reviewed-on: https://gerrit.chromium.org/gerrit/38847
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Ready: Simran Basi <sbasi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
1 file changed