New memento updater --command handler and main
Create a new memento updater that are capable of handling all kinds of
update/install requests.
This commit is for command parsing and main function.
BUG=chrome-os-partner:21938
TEST=Pass Manual Install Test
Change-Id: I0fd7f52fd3031262c788fd91568ef4a99525b42f
Reviewed-on: https://chromium-review.googlesource.com/67046
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
14 files changed
