Please review: Ticket #569: examine replication code to reduce amount of stored state information

[Ludwig Krispenz]

I have sent this for review some time ago, in between I verifed the TET 
results and the new patch is based on a later state of master.

https://fedorahosted.org/389/ticket/569

https://fedorahosted.org/389/attachment/ticket/569/0001-New-Reduce-replic...