Use initial State as network ID

[mikera]

We should use the initial state Hash as the network ID when syncing Peers to test compatibility.

If a Peer creates its own local network, it will need to include its own public key in the state, which will guarantee a unique hash compared to the public network or a network created by other private peers.

[mikera]

I've added the initial state Hash to the Peer STATUS response to support this capability. Just need to ensure that relying parties check this appropriately.

[mikera]

@billbsing can you check that this is used and enforced correctly? Might want an integration test where a Peer tries to connect to another Network (should fail)