Override flag to disable the seam / revert to old path

[searls]

If someone is working on master and wants to be able to push to production safely while the :new code path is still under development or otherwise not tested, let them hide it behind a flag that will override all other Suture options and guarantee to call the old code path and take no other action (the NoOp command)

What's a good name for this? SUTURE_DISABLE=true / :disable => true?