[Protocol KV Store] Update bootstrapping to support transferring KVStore from old network to new

[jordanschalm]

At the moment, the bootstrapping code always generates a KV-Store filled with default data. This will need to change when:

• we need to spork a network and
• we want to carry over KV Store changes from the prior network to the new network

Update bootstrapping to support carrying over values from the pre-Spork network or adding more data via the bootstrapping configuration.