Add a red_rollback call to Reliance-Edge.

[jcdubois]

This check-in adds a red_rollback() feature to Reliance-Edge

It is adding:

• A red_rollback() call at posix level
• A RedCoreVolRollback() call in the core API

Signed-off-by: Jean-Christophe Dubois jcd@tribudubois.net

[jcdubois]

Some time ago, I asked if you were planning for a rollback feature on RE.

You added it on a feature request list somewhere but it is not obviously part of your short term roadmap.

So here is my proposal to implement this feature.

It might be a bit too coarse but it is working as expected in my tests.

I hope you'll find these changes OK

[danielrlewis]

Commit for the FSE API looks good.