network: implement exponential backoff for retries
network: implement exponential backoff for retries

spesmilo/electrum,vialectrum/vialectrum,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,wakiyamap/electrum-mona,vialectrum/vialectrum,wakiyamap/electrum-mona,spesmilo/electrum,wakiyamap/electrum-mona,pooler/electrum-ltc,vialectrum/vialectrum,wakiyamap/electrum-mona,pooler/electrum-ltc,pooler/electrum-ltc