fixed: don't use thread::sleep_for where it's known to be broken
fixed: don't use thread::sleep_for where it's known to be broken

Fixes #2690.

renatolage/wallets-BRCoin,raasakh/bardcoin.exe,brettwittam/geocoin,phelixbtc/bitcoin,CarpeDiemCoin/CarpeDiemLaunch,pdrobek/Polcoin-1-3,memorycoin/memorycoin,OfficialTitcoin/titcoin-wallet,vbernabe/freicoin,applecoin-official/fellatio,Adaryian/E-Currency,zestcoin/ZESTCOIN,raasakh/bardcoin,cinnamoncoin/groupcoin-1,cryptohelper/premine,totallylegitbiz/totallylegitcoin,Dinarcoin/dinarcoin,Climbee/artcoin,KillerByte/memorypool,glv2/peerunity,goldmidas/goldmidas,renatolage/wallets-BRCoin,Enticed87/Decipher,brettwittam/geocoin,peacedevelop/peacecoin,cinnamoncoin/groupcoin-1,ppcoin/ppcoin,osuyuushi/laughingmancoin,howardrya/AcademicCoin,madman5844/poundkoin,Dinarcoin/dinarcoin,cryptocoins4all/zcoin,llamasoft/ProtoShares_Cycle,Carrsy/PoundCoin,borgcoin/Borgcoin.rar,totallylegitbiz/totallylegitcoin,memorycoin/memorycoin,applecoin-official/applecoin,webdesignll/coin,peercoin/peercoin,dobbscoin/dobbscoin-source,ionux/freicoin,barcoin-project/nothingcoin,ddombrowsky/radioshares,webdesignll/coin,Carrsy/PoundCoin,MitchellMintCoins/AutoCoin,glv2/peerunity,WorldLeadCurrency/WLC,keisercoin-official/keisercoin,jimblasko/UnbreakableCoin-master,borgcoin/Borgcoin1,howardrya/AcademicCoin,hg5fm/nexuscoin,mammix2/ccoin-dev,BenjaminsCrypto/Benjamins-1,Climbee/artcoin,borgcoin/Borgcoin1,brettwittam/geocoin,raasakh/bardcoin,applecoin-official/applecoin,compasscoin/compasscoin,BenjaminsCrypto/Benjamins-1,metrocoins/metrocoin,bitpagar/bitpagar,keisercoin-official/keisercoin,therealaltcoin/altcoin,mammix2/ccoin-dev,Earlz/dobbscoin-source,jimblasko/2015_UNB_Wallets,brettwittam/geocoin,MitchellMintCoins/MortgageCoin,DigitalPandacoin/pandacoin,osuyuushi/laughingmancoin,osuyuushi/laughingmancoin,peercoin/peercoin,SocialCryptoCoin/SocialCoin,borgcoin/Borgcoin.rar,therealaltcoin/altcoin,phelixbtc/bitcoin,hg5fm/nexuscoin,peercoin/peercoin,barcoin-project/nothingcoin,applecoin-official/fellatio,BenjaminsCrypto/Benjamins-1,peerdb/cors,jimblasko/UnbreakableCoin-master,barcoin-project/nothingcoin,Adaryian/E-Currency,llamasoft/ProtoShares_Cycle,Climbee/artcoin,cryptohelper/premine,zestcoin/ZESTCOIN,Carrsy/PoundCoin,borgcoin/Borgcoin1,barcoin-project/nothingcoin,qubitcoin-project/QubitCoinQ2C,goldmidas/goldmidas,raasakh/bardcoin.exe,cryptohelper/premine,dobbscoin/dobbscoin-source,kevin-cantwell/crunchcoin,phelixbtc/bitcoin,OfficialTitcoin/titcoin-wallet,DigitalPandacoin/pandacoin,SocialCryptoCoin/SocialCoin,zestcoin/ZESTCOIN,compasscoin/compasscoin,ddombrowsky/radioshares,bitshares/bitshares-pts,keisercoin-official/keisercoin,ionux/freicoin,vbernabe/freicoin,howardrya/AcademicCoin,borgcoin/Borgcoin1,raasakh/bardcoin.exe,therealaltcoin/altcoin,raasakh/bardcoin,dobbscoin/dobbscoin-source,peerdb/cors,metrocoins/metrocoin,raasakh/bardcoin,metrocoins/metrocoin,osuyuushi/laughingmancoin,llamasoft/ProtoShares_Cycle,borgcoin/Borgcoin1,goldmidas/goldmidas,peerdb/cors,BenjaminsCrypto/Benjamins-1,madman5844/poundkoin,bitshares/bitshares-pts,cainca/liliucoin,applecoin-official/applecoin,MitchellMintCoins/AutoCoin,jimblasko/2015_UNB_Wallets,Dinarcoin/dinarcoin,ddombrowsky/radioshares,WorldLeadCurrency/WLC,applecoin-official/fellatio,5mil/Tradecoin,KillerByte/memorypool,5mil/Tradecoin,SocialCryptoCoin/SocialCoin,peerdb/cors,raasakh/bardcoin,glv2/peerunity,jimblasko/2015_UNB_Wallets,hg5fm/nexuscoin,therealaltcoin/altcoin,tripmode/pxlcoin,tripmode/pxlcoin,metrocoins/metrocoin,peerdb/cors,raasakh/bardcoin.exe,tripmode/pxlcoin,renatolage/wallets-BRCoin,CarpeDiemCoin/CarpeDiemLaunch,ppcoin/ppcoin,5mil/Tradecoin,kevin-cantwell/crunchcoin,OfficialTitcoin/titcoin-wallet,bitshares/bitshares-pts,Enticed87/Decipher,qubitcoin-project/QubitCoinQ2C,memorycoin/memorycoin,memorycoin/memorycoin,Earlz/dobbscoin-source,raasakh/bardcoin.exe,hg5fm/nexuscoin,Earlz/dobbscoin-source,dobbscoin/dobbscoin-source,cainca/liliucoin,vbernabe/freicoin,renatolage/wallets-BRCoin,kevin-cantwell/crunchcoin,OfficialTitcoin/titcoin-wallet,cainca/liliucoin,ionux/freicoin,barcoin-project/nothingcoin,starwalkerz/fincoin-fork,Earlz/dobbscoin-source,peacedevelop/peacecoin,cainca/liliucoin,WorldLeadCurrency/WLC,totallylegitbiz/totallylegitcoin,starwalkerz/fincoin-fork,cryptohelper/premine,peerdb/cors,pdrobek/Polcoin-1-3,Adaryian/E-Currency,therealaltcoin/altcoin,peacedevelop/peacecoin,cinnamoncoin/groupcoin-1,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,cinnamoncoin/groupcoin-1,kevin-cantwell/crunchcoin,metrocoins/metrocoin,totallylegitbiz/totallylegitcoin,MitchellMintCoins/AutoCoin,Dinarcoin/dinarcoin,KillerByte/memorypool,goldmidas/goldmidas,phelixbtc/bitcoin,cinnamoncoin/groupcoin-1,webdesignll/coin,SocialCryptoCoin/SocialCoin,DigitalPandacoin/pandacoin,CarpeDiemCoin/CarpeDiemLaunch,memorycoin/memorycoin,vbernabe/freicoin,mammix2/ccoin-dev,borgcoin/Borgcoin.rar,gjhiggins/fuguecoin,memorycoin/memorycoin,keisercoin-official/keisercoin,dobbscoin/dobbscoin-source,mammix2/ccoin-dev,compasscoin/compasscoin,Dinarcoin/dinarcoin,ppcoin/ppcoin,gjhiggins/fuguecoin,Adaryian/E-Currency,MitchellMintCoins/AutoCoin,jimblasko/UnbreakableCoin-master,applecoin-official/fellatio,Climbee/artcoin,zestcoin/ZESTCOIN,goldmidas/goldmidas,MitchellMintCoins/AutoCoin,keisercoin-official/keisercoin,jimblasko/2015_UNB_Wallets,cainca/liliucoin,applecoin-official/applecoin,glv2/peerunity,qubitcoin-project/QubitCoinQ2C,applecoin-official/fellatio,ddombrowsky/radioshares,bitpagar/bitpagar,KillerByte/memorypool,qubitcoin-project/QubitCoinQ2C,pdrobek/Polcoin-1-3,peacedevelop/peacecoin,peacedevelop/peacecoin,KillerByte/memorypool,WorldLeadCurrency/WLC,phelixbtc/bitcoin,jimblasko/UnbreakableCoin-master,howardrya/AcademicCoin,peercoin/peercoin,Carrsy/PoundCoin,applecoin-official/applecoin,cryptocoins4all/zcoin,CarpeDiemCoin/CarpeDiemLaunch,DigitalPandacoin/pandacoin,Carrsy/PoundCoin,raasakh/bardcoin.exe,zestcoin/ZESTCOIN,vbernabe/freicoin,bitpagar/bitpagar,qubitcoin-project/QubitCoinQ2C,MitchellMintCoins/MortgageCoin,Climbee/artcoin,raasakh/bardcoin,5mil/Tradecoin,bitpagar/bitpagar,howardrya/AcademicCoin,borgcoin/Borgcoin.rar,WorldLeadCurrency/WLC,5mil/Tradecoin,cryptohelper/premine,hg5fm/nexuscoin,osuyuushi/laughingmancoin,OfficialTitcoin/titcoin-wallet,ionux/freicoin,cryptocoins4all/zcoin,vbernabe/freicoin,ionux/freicoin,WorldLeadCurrency/WLC,jimblasko/2015_UNB_Wallets,madman5844/poundkoin,cryptocoins4all/zcoin,cryptocoins4all/zcoin,ppcoin/ppcoin,peercoin/peercoin,starwalkerz/fincoin-fork,MitchellMintCoins/MortgageCoin,compasscoin/compasscoin,pdrobek/Polcoin-1-3,ionux/freicoin,tripmode/pxlcoin,bitshares/bitshares-pts,compasscoin/compasscoin,Enticed87/Decipher,CarpeDiemCoin/CarpeDiemLaunch,Earlz/dobbscoin-source,SocialCryptoCoin/SocialCoin,MitchellMintCoins/MortgageCoin,brettwittam/geocoin,gjhiggins/fuguecoin,Earlz/dobbscoin-source,kevin-cantwell/crunchcoin,ddombrowsky/radioshares,borgcoin/Borgcoin.rar,llamasoft/ProtoShares_Cycle,mammix2/ccoin-dev,tripmode/pxlcoin,peercoin/peercoin,Enticed87/Decipher,totallylegitbiz/totallylegitcoin,MitchellMintCoins/MortgageCoin,pdrobek/Polcoin-1-3,webdesignll/coin,Adaryian/E-Currency,madman5844/poundkoin,bitshares/bitshares-pts,renatolage/wallets-BRCoin,dobbscoin/dobbscoin-source,webdesignll/coin,jimblasko/UnbreakableCoin-master,Enticed87/Decipher,cinnamoncoin/groupcoin-1,starwalkerz/fincoin-fork,gjhiggins/fuguecoin,gjhiggins/fuguecoin