[autotest] add platform_TLSDate

This test exercises the tlsdate{,d} tools.

BUG=chromium-os:31505
TEST=sure is

Change-Id: Iad30dd9e8da60c1475e443a8df61617602c6c5b8
Signed-off-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34132
Reviewed-by: Will Drewry <wad@chromium.org>
5 files changed