Fix PeerGroup.peers iterator synchronization
Fix PeerGroup.peers iterator synchronization

devrandom/bitcoinj,MonetaryUnit/monetaryunitj,keremhd/mintcoinj,peacekeeper/bitcoinj,HashEngineering/maxcoinj,dogecoin/libdohj,troggy/bitcoinj,veritaseum/bitcoinj,stafur/trustpluscoinj,devrandom/bitcoinj,kris-davison/non-working-darkcoinj-fork,rootstock/bitcoinj,VegasCoin/vegascoinj,coinspark/sparkbit-bitcoinj,jdojff/bitcoinj,HashEngineering/myriadcoinj,bankonme/monetaryunitj,mrosseel/bitcoinj-old,blockchain/bitcoinj,TrustPlus/trustpluscoinj,PeterNSteinmetz/peternsteinmetz-bitcoinj,HashEngineering/mobilecashj,yenliangl/bitcoinj,Coinomi/bitcoinj,stonecoldpat/bitcoinj,kmels/bitcoinj,marctrem/bitcoinj,stonecoldpat/bitcoinj,bitsquare/bitcoinj,MintcoinCommunity/mintcoinj,kmels/bitcoinj,bitcoinj/bitcoinj,jdojff/bitcoinj,patricklodder/libdohj,DigiByte-Team/digibytej-alice,HashEngineering/digitalcoinj,stafur/trustpluscoinj,haxwell/bitcoinj,GroestlCoin/groestlcoinj,funkshelper/bitcoinj,habibmasuro/smileycoinj,HashEngineering/dashj,HashEngineering/digitalcoinj,Coinomi/bitcoinj,stafur/trustpluscoinj,therightwaystudio/fork_bitcoinj,cannabiscoindev/cannabiscoinj,techsubodh/admin_tracker,akonring/bitcoinj_generous,HashEngineering/infinitecoinj,HashEngineering/maxcoinj,tjth/bitcoinj-lotterycoin,HashEngineering/mobilecashj,janko33bd/bitcoinj,DigiByte-Team/digibytej-alice,oscarguindzberg/bitcoinj,reddcoin-project/reddcoinj-pow,TheBlueMatt/bitcoinj,HashEngineering/quarkcoinj,RobKohr/bitcoinj,szdx/bitcoinj,HashEngineering/groestlcoinj,langerhans/bitcoinj-alice-hd,oscarguindzberg/bitcoinj,HashEngineering/dimecoinj,VegasCoin/vegascoinj,FTraian/bitcoinj-uc,Kefkius/groestlcoinj,HashEngineering/megacoinj,HashEngineering/digitalcoinj,Crypto-Expert/digitalcoinj,rnicoll/altcoinj,HashEngineering/groestlcoinj,bitcoin-solutions/bitcoinj-alice,tangyves/bitcoinj,HashEngineering/myriadcoinj,tangyves/bitcoinj,Kefkius/groestlcoinj,hughneale/bitcoinj,nikileshsa/bitcoinj,Kefkius/groestlcoinj,you21979/bitcoinj,HashEngineering/anycoinj,HashEngineering/unobtaniumj,HashEngineering/maxcoinj,peterdettman/bitcoinj,HashEngineering/groestlcoinj,HashEngineering/megacoinj,FTraian/bitcoinj-uc,GroestlCoin/groestlcoinj,kris-davison/non-working-darkcoinj-fork,bitbandi/spreadcoinj,designsters/android-fork-bitcoinj,rnicoll/bitcoinj,Qw0kka/creditsj,peterdettman/bitcoinj,you21979/bitcoinj,jife94/bitcoinj,monapu/monacoinj-multibit,HashEngineering/namecoinj,VegasCoin/vegascoinj,paulminer/bitcoinj,kurtwalker/bitcoinj,yezune/darkcoinj,bitbandi/spreadcoinj,yenliangl/bitcoinj,dalbelap/bitcoinj,lavajumper/bitcoinj-scrypt,cpacia/bitcoinj,yezune/darkcoinj,stafur/trustpluscoinj,MintcoinCommunity/mintcoinj,cannabiscoindev/cannabiscoinj,HashEngineering/unobtaniumj,TrustPlus/trustpluscoinj,bitbandi/spreadcoinj,tangyves/bitcoinj,pelle/bitcoinj,techsubodh/admin_tracker,schildbach/bitcoinj,MonetaryUnit/monetaryunitj,HashEngineering/frankoj,kurtwalker/bitcoinj,TrustPlus/trustpluscoinj,sserrano44/bitcoinj-watcher-service,GroestlCoin/groestlcoinj,meeh420/anoncoinj,langerhans/dogecoinj-new,bitcoin-solutions/bitcoinj-alice,langerhans/dogecoinj-alice,HashEngineering/mobilecashj,Kefkius/groestlcoinj,HashEngineering/dimecoinj,strawpay/bitcoinj,Enigmachine/btcjwork2,haxwell/bitcoinj,Kefkius/groestlcoinj,ahmedbodi/anycoinj,dcw312/bitcoinj,janko33bd/bitcoinj,habibmasuro/smileycoinj,patricklodder/bitcoinj,HashEngineering/darkcoinj,HashEngineering/unobtaniumj,fsb4000/bitcoinj,dexX7/bitcoinj,greenaddress/bitcoinj,HashEngineering/frankoj,Coinomi/bitcoinj,veritaseum/bitcoinj,HashEngineering/darkcoinj,bankonme/monetaryunitj,reddcoin-project/reddcoinj-pow,kurtwalker/bitcoinj,lavajumper/bitcoinj-scrypt,DynamicCoinOrg/dmcJ,stonecoldpat/bitcoinj,cpacia/bitcoinj,praus/multicoinj,HashEngineering/namecoinj,jife94/bitcoinj,cpacia/bitcoinj,HashEngineering/dimecoinj,RaviAjaibSingh/bitcoinj,HashEngineering/digitalcoinj-mb,dldinternet/bitcoinj,yezune/darkcoinj,DigiByte-Team/digibytej-alice,bitcoin-solutions/bitcoinj-alice,hank/feathercoinj,jjculber/defcoinj,TheBlueMatt/bitcoinj,UberPay/bitcoinj,jdojff/bitcoinj,patricklodder/bitcoinj,patricklodder/libdohj,bitbandi/spreadcoinj,novitski/bitcoinj,natzei/bitcoinj,bitcoinj/bitcoinj,hank/litecoinj,cannabiscoindev/cannabiscoinj,ligi/bitcoinj,tjth/bitcoinj-lotterycoin,devrandom/bitcoinj,VishalRao/bitcoinj,habibmasuro/litecoinj,HashEngineering/dashj,fsb4000/bitcoinj,you21979/bitcoinj,veritaseum/bitcoinj,imsaguy/bitcoinj,natzei/bitcoinj,kris-davison/non-working-darkcoinj-fork,RobKohr/bitcoinj,fsb4000/bitcoinj,MonetaryUnit/monetaryunitj,rnicoll/libdohj,FTraian/bitcoinj-uc,cbeams/bitcoinj,HashEngineering/myriadcoinj,HashEngineering/maxcoinj,HashEngineering/dashj,techsubodh/admin_tracker,jife94/bitcoinj,HashEngineering/quarkcoinj,MintcoinCommunity/mintcoinj,patricklodder/libdohj,TheBlueMatt/bitcoinj,yezune/darkcoinj,ahmedbodi/anycoinj,haxwell/bitcoinj,tjth/bitcoinj-lotterycoin,bitbandi/spreadcoinj,lavajumper/bitcoinj-scrypt,HashEngineering/dashj,hank/litecoinj-new,AugieMillares/bitcoinj,HashEngineering/megacoinj,HashEngineering/maxcoinj,bankonme/monetaryunitj,HashEngine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