paycheck: src/dst -> old/new in applier code
The old/new terminology is consistent with that used in update payload
manifest, as well as other parts of the update_payload library (e.g.
checker).
BUG=None
TEST=Unit/integration test passes
Change-Id: I91244ae8adf073b958e8cd7e7670341f056c848e
Reviewed-on: https://gerrit.chromium.org/gerrit/50130
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>
3 files changed
