Testing features for custom loopback isonets

[Meshiest]

Motivation

In order to test against mainnet entirely locally, outside of dev-mode this PR does the following:

1. changes some assumptions for peers with loopback addresses to allow a peer bound on 127.0.0.1 to connect to a peer bound on 127.0.0.2 without sharing loopback address peers with non-local peers
2. allows for specifying bootstrap peers with the BOOTSTRAP_PEERS=127.0.0.2,127.0.0.3 environment
3. allows for specifying custom generated genesis blocks via snarkos start --genesis ./path/to/block.genesis

This collection of features also empowers end users to create more dynamic isonets for their own internal testing of snarkOS.

To use these changes, simply specify BOOTSTRAP_PEERS=127.0.1.2 before your start command, and specify the loopback address in --node 127.0.1.2:3030 or --bft 127.0.1.2:5000.

Testing plan

• I use these changes to setup my entirely local 4 validator, 4 bootstrap/core client, 4 fringe client network for [Feature] Introduce IP-level bans for connection spam targeting validators #3366, but I use snarkops as the configuration coordinator

Related PRs

• Useful for testing [Feature] Introduce IP-level bans for connection spam targeting validators #3366 and Extend the IP-level ban to Router-bound connections #3388 as 127.0.0.1 and 127.0.0.2 can be run on the same machine while still having distinct addresses

[Meshiest]

committee.json
genesis.block.zip
genesis.json
client.json

Here is a genesis block generated by the aot command from the snarkops project that can be used for a simple 4 validator mainnet
(--network 0) along with the committee's keys and some generated keys for running client nodes.

My topology is as follows (ports omitted in the table)

BOOTSTRAP_PEERS=127.0.2.1:4130,127.0.2.2:4130,127.0.2.3:4130,127.0.2.4:4130

Validators are peered with bootstrap peers, fringe clients rely on bootstrap peers for peering.

type	ip	validators	peers
validator	127.0.1.1	127.0.1.2,127.0.1.3,127.0.1.4	127.0.2.1,127.0.2.2,127.0.2.3,127.0.2.4
validator	127.0.1.2	127.0.1.1,127.0.1.3,127.0.1.4	127.0.2.1,127.0.2.2,127.0.2.3,127.0.2.4
validator	127.0.1.3	127.0.1.2,127.0.1.1,127.0.1.4	127.0.2.1,127.0.2.2,127.0.2.3,127.0.2.4
validator	127.0.1.4	127.0.1.2,127.0.1.3,127.0.1.1	127.0.2.1,127.0.2.2,127.0.2.3,127.0.2.4
core/bootstrap client	127.0.2.1		127.0.1.1,127.0.1.2,127.0.1.3,127.0.1.4
core/bootstrap client	127.0.2.2		127.0.1.1,127.0.1.2,127.0.1.3,127.0.1.4
core/bootstrap client	127.0.2.3		127.0.1.1,127.0.1.2,127.0.1.3,127.0.1.4
core/bootstrap client	127.0.2.4		127.0.1.1,127.0.1.2,127.0.1.3,127.0.1.4
fringe client	127.0.2.5
fringe client	127.0.2.6
fringe client	127.0.2.7
fringe client	127.0.2.8