ReplicationConfig tables and changes

With the changes bringing in StorageRegions and other information regarding where data is in Chronopolis, we also want a way to create replications for bags at various nodes. To do this we will need an extra replication_config table which includes information about how to create replications for a storage region. It should be noted that for the moment only rsync will be supported.

We might also want an endpoint for creating replications for a bag, but that is tbd.