* Insert blobs into db_ledger in broadcast stage to support leader to validator transitions
* Add transmitting real slots to broadcast stage
* Handle real slots instead of default slots in window
* Switch to dummy repair on slots and modify erasure to support leader rotation
* Shorten length of holding locks
* Remove logger from replicator test
* Move more of the replicator logic into the replicator class
* Add support for the RPC interface to query the storage last_id value
that the replicator would sign and use to pick a block.
* Fix replicator connecting to gossip and change test to exercise that
scenario.