Hard-coded value in core-exchange-json-rpc

[NayiemWillems]

Expected Behavior

Installing core with the RPC module should allow users to communicate with the node and the network that the node is using.

Current Behavior

Instead of connecting to the network of the node, it grabs hard-coded values from 'exchange-json-rpc' that pulls data from the Ark network.

The package.json in 'core-exchange-json-rpc' shows a dependency called 'exchange-json-rpc' at line 24.

Heading over to this dependency in the 'network.ts' file, it pulls network data from Ark peers:
https://github.com/ArkEcosystem/exchange-json-rpc/blob/master/packages/rpc/src/services/network.ts

At line: 112 and 122.

Possible Solution

It should take the peers and port from a local folder or config file.
Probably in this format: ${resolve(process.env.CORE_PATH_CONFIG)}/peers.json

Steps to Reproduce (for bugs)

1. Install a node from a bridgechain that is on the same node version as Ark. (Qredit is already patched with a temporary fix Qredit/core@28c6d10)
2. Enable RPC
3. Enter: curl -X POST -H "Content-Type: application/vnd.api+json" http://127.0.0.1:8080/ -d '{"jsonrpc":"2.0", "id":"1", "method":"transactions.info", "params":{"id":"b094b11e61c6f7ff8afb45aa1f264f1b14b175c6d40a8be6bb217989e40f18fe"}}'
4. Replace transaction ID with the one that belongs to the bridgechain.
5. It will return that the tx is not found, unless its a Ark transaction.

(any other command, like blockheight, network information etc will also return data from the Ark blockchain)

Context

Was trying to help TradeSatoshi integrate a bridgechain on their exchange using RPC.

Your Environment

Used core-control to install the node.

[ghost]

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