Improved container-sync resiliency

container-sync now skips faulty objects in the first and second rounds.
All replicas try in the second round.
No server will give up until the faulty object suceeds

Fixes: bug #1068423

Change-Id: I0defc174b2ce3796a6acf410a2d2eae138e8193d
Merge "Improved container-sync resiliency"