Feature - Add bitcoind/litecoind support to broker

[dannypaz]

Description

This adds litecoind/bitcoind support to the broker in the form of build commands.

npm run build local - simnet setup w/ btcd/ltcd
npm run build - user defined (user must edit their own .env files)

All currency networks, other than simnet, make use of bitcoind/litecoind.

BREAKING CHANGE:

This PR may have unintended consequences when a user upgrades. This PR changes the default currency daemons from btcd/ltcd to bitcoind/litecoind.

Tasks:

1. Backup user wallet
2. start bitcoind/litecoind and let them sync to testnet
3. Remove blocks directory from lnd
4. Start docker-compose up -d

More information will be posted in changelog

Related PRs

sparkswap/lnd-engine#102
sparkswap/lnd-engine#100
https://github.com/sparkswap/relayer/pull/169
sparkswap/lnd#15

Todos

• [n/a] Tests
• Documentation
• Link to Trello

[dannypaz]

Development Regtest Setup

[treygriffith]

This is a pretty significant breaking change and for anyone that has a broker running will require pretty big changes (including re-syncing, etc).

Can we note this as a breaking change somewhere and include some migration documentation?

[dannypaz]

@treygriffith The changes should be minimal and should not require a lot of downtime. Im hesitant to call this a major breaking change.

In the best-case scenario, the nodes for currencies (bitcoind/litecoind) should be interchangable as LND owns the wallet. You'll only be required to startup the bitcoind/litecoind nodes, get them synced, then change the docker config and you should be all set.

Now in our case, if we swapped the instances, I would probably expect LND to yell about "Block out of order" and we'd have to remove the blocks folder from LND.

Either way, we will figure out a migration plan.

[treygriffith]

LGTM as soon as we have migration docs