add option to RpcClient to enable keep-alive (false by default)
add option to RpcClient to enable keep-alive (false by default)

KainiIndustries/hullcore,genecyber/bitcore,janko33bd/bitcore,Kefkius/clamcore,TeamPiggyCoin/PiggyCore,maraoz/dogecore,pembo210/Litecore,MulticoinExplorer/bitcore,casinocoin/csc-bitcore-v0.1,GroestlCoin/groestlcore,casinocoin/csc-bitcore-v0.1,bitjson/bitcore,initaldk/bitcore,initaldk/bitcore,sEpuLchEr/bitcore,janko33bd/bitcore,MulticoinExplorer/bitcore,Bushstar/bitcore,TeamPiggyCoin/PiggyCore,Bushstar/feathercore,sEpuLchEr/bitcore,UdjinM6/darkcore,braydonf/bitcore,TOMOAKI12345/bitcore,UdjinM6/darkcore,pembo210/Litecore,pnagurny/bitcore,pnagurny/bitcore,pembo210/Litecore,Bushstar/bitcore,eordano/bitcore,habibmasuro/reddcore,habibmasuro/reddcore,lekkas/bitcore,braydonf/bitcore,maraoz/coinforge,UdjinM6/bitcore-dash,phplaboratory/bitcore,Bushstar/bollycore,bitjson/bitcore,Bushstar/bitcore,casinocoin/csc-bitcore-v0.1,martindale/bitcore,williamcotton/bitcore,daxxog/clamcore,litecoin-project/litecore,habibmasuro/reddcore,bitjson/bitcore,Bushstar/feathercore,haobtc/bitcore,UdjinM6/darkcore,iobond/bitcore,bitpay/bitcore,haobtc/bitcore,eordano/bitcore,Bushstar/bitcore,maraoz/coinforge,Bushstar/talentcore,martindale/bitcore,MulticoinExplorer/bitcore,Kefkius/clamcore,KainiIndustries/hullcore,Kefkius/clamcore,MonetaryUnit/bitcore,iobond/bitcore,Kefkius/clamcore,olalonde/bitcore,iobond/bitcore,bankonme/bitcore,eXcomm/bitcore,maraoz/dogecore,adjoinant/bitcore,UdjinM6/darkcore,sEpuLchEr/bitcore,Bushstar/bollycore,Bushstar/talentcore,phplaboratory/bitcore,haobtc/bitcore,jcvernaleo/bitcore,KainiIndustries/hullcore,eXcomm/bitcore,casinocoin/csc-bitcore-v0.1,daxxog/clamcore,bilthon/bitcore,UdjinM6/darkcore,maraoz/dogecore,pembo210/Litecore,Bushstar/feathercore,lekkas/bitcore,bankonme/bitcore,Kefkius/clamcore,KainiIndustries/hullcore,casinocoin/csc-bitcore-v0.1,casinocoin/csc-bitcore-v0.1,litecoin-project/litecore,MulticoinExplorer/bitcore,habibmasuro/reddcore,sEpuLchEr/bitcore,Bushstar/bollycore,Bushstar/bollycore,olalonde/bitcore,martindale/bitcore,Bushstar/feathercore,sEpuLchEr/bitcore,bilthon/bitcore,Bushstar/bitcore,Bushstar/talentcore,adjoinant/bitcore,williamcotton/bitcore,haobtc/bitcore,MulticoinExplorer/bitcore,MonetaryUnit/bitcore,iobond/bitcore,habibmasuro/reddcore,bitpay/bitcore,genecyber/bitcore,haobtc/bitcore,Bushstar/talentcore,bitpay/bitcore,KainiIndustries/hullcore,bitpay/bitcore,martindale/bitcore,KainiIndustries/hullcore,UdjinM6/darkcore,jcvernaleo/bitcore,maraoz/dogecore,TOMOAKI12345/bitcore,iobond/bitcore,bitjson/bitcore