restore Ethersocial Network(ESN) node

[hackmod]

Ethersocial Network(ESN) node accidentally removed by commit 9e17f21
and recently, node health check method changed by commit fffa10b

We will add net_listening api method asap.

additionally, missing ledger support for ESN added.

cc: @magnalucus, @kimmyeonghun

[turbobit]

net_listening api method added.

Request example
curl -H "Content-Type: application/json" -X POST https://api.esn.gonspool.com -d '{"jsonrpc":"2.0","method":"net_listening","params":[],"id":83}'

Return example
{"jsonrpc":"2.0","id":"83","result":true}

Reference
https://github.com/ethereum/wiki/wiki/JSON-RPC#net_listening

[ghost]

ESN is a well known scam with ETSC!!! DO NOT MERGE THIS COMMIT!!!

[hackmod]

@chainkoreauser == airking. do not feed the real scam developer

[ghost]

I am not airking @hackmod , I am a scam victim from you guys, ESN and ETSC!!! 👿👿👿

[hackmod]

Ethersocial Network was incubated at the biggest mining community named DDengle(https://www.ddengle.com/esn ) in South Korea.

• main site: https://ethersocial.network
• block explorer: https://ethersocial.net (based on the ETC explorer)
• CMC: https://coinmarketcap.com/currencies/ethersocial/
• exchange: https://www.bit-z.com/exchange/esn_btc
• Trezor supported, MEW supported, MyCrypto supported

all ESN related sites are currently working.

[ghost]

Ethersocial is very related with Ethereum Social and it should be considered as a scam whether or not site is alive. It wouldn't be surprisable when ETSC guys come back and scam people, or maybe ESN's dev are the same people with ETSC 😂

I need compensation with my lost funds with Youbit hack and ESN scam , until then I will keep boycott ESN from open-source community 👿👿👿

[hackmod]

See also MyEtherWallet#1879

ghost == airking

chainkorea == airking

[hackmod]

any reason not merging this PR for 3 months?