Ticket 48954 - replication fails because anchorcsn cannot be found
Bug Description: the anchorcsn is calculated based on supploier and consumer
ruv. If this csn is not found in the changelog
replication stops.
Fix Description: Fix consists of two parts
1. log start-iteration csn record for all replicas
after initialization
2. If the csn still cannot be found
- log an error
- use the closest csn available by calling
cursor->c_get with DB_SET_RANGE instead of DB_SET
https://fedorahosted.org/389/ticket/48954
Reviewed by: Noriko, Thierry. thanks