Ignore getaddr messages on Outbound connections.
Ignore getaddr messages on Outbound connections.

The only time when a client sends a "getaddr" message is when he
esatblishes an Outbound connection (see ProcessMessage() in
src/main.cpp).  Another bitcoin client is expected to receive a
"getaddr" message only on Inbound connection. Ignoring "gettaddr"
requests on Outbound connections can resolve potential privacy issues
(and as was said such request normally do not happen anyway).

Rebased-From: dca799e1db6e319fdd47e0bfdb038eab0efabb85
Github-Pull: #5442

fullcoins/fullcoin,fussl/elements,DynamicCoinOrg/DMC,Mrs-X/PIVX,apoelstra/elements,OmniLayer/omnicore,alejandromgk/Lunar,mycointest/owncoin,genavarov/lamacoin,UdjinM6/dash,schinzelh/dash,thelazier/dash,oklink-dev/bitcoin,capitalDIGI/litecoin,Bloom-Project/Bloom,aburan28/elements,upgradeadvice/MUE-Src,MazaCoin/maza,ArgonToken/ArgonToken,worldbit/worldbit,xuyangcn/opalcoin,ptschip/bitcoinxt,biblepay/biblepay,ivansib/sib16,lakepay/lake,48thct2jtnf/P,ahmedbodi/test2,MazaCoin/mazacoin-new,grumpydevelop/singularity,willwray/dash,droark/elements,biblepay/biblepay,MazaCoin/maza,ptschip/bitcoinxt,Thracky/monkeycoin,truthcoin/blocksize-market,mycointest/owncoin,Petr-Economissa/gvidon,rsdevgun16e/energi,antcheck/antcoin,rsdevgun16e/energi,OstlerDev/florincoin,dev1972/Satellitecoin,grumpydevelop/singularity,Rav3nPL/doubloons-0.10,fullcoins/fullcoin,biblepay/biblepay,schinzelh/dash,capitalDIGI/DIGI-v-0-10-4,puticcoin/putic,BlockchainTechLLC/3dcoin,OstlerDev/florincoin,ionomy/ion,ingresscoin/ingresscoin,gwillen/elements,Thracky/monkeycoin,pstratem/elements,okinc/bitcoin,aburan28/elements,coinkeeper/2015-06-22_18-52_viacoin,HeliumGas/helium,RibbitFROG/ribbitcoin,ingresscoin/ingresscoin,ingresscoin/ingresscoin,lakepay/lake,ionomy/ion,mikehearn/bitcoinxt,zottejos/merelcoin,GwangJin/gwangmoney-core,PIVX-Project/PIVX,mikehearn/bitcoinxt,BlockchainTechLLC/3dcoin,gwillen/elements,pelorusjack/BlockDX,CoinProjects/AmsterdamCoin-v4,capitalDIGI/DIGI-v-0-10-4,xawksow/GroestlCoin,fullcoins/fullcoin,florincoin/florincoin,projectinterzone/ITZ,my-first/octocoin,PIVX-Project/PIVX,putinclassic/putic,HeliumGas/helium,thelazier/dash,rsdevgun16e/energi,Rav3nPL/doubloons-0.10,CoinProjects/AmsterdamCoin-v4,worldbit/worldbit,zottejos/merelcoin,rdqw/sscoin,tropa/axecoin,droark/elements,ticclassic/ic,benzmuircroft/REWIRE.io,ediston/energi,coinkeeper/2015-06-22_18-52_viacoin,Electronic-Gulden-Foundation/egulden,mockcoin/mockcoin,npccoin/npccoin,droark/elements,xawksow/GroestlCoin,genavarov/brcoin,mapineda/litecoin,DMDcoin/Diamond,rsdevgun16e/energi,antcheck/antcoin,nmarley/dash,ahmedbodi/test2,genavarov/ladacoin,ColossusCoinXT/ColossusCoinXT,mycointest/owncoin,mikehearn/bitcoinxt,zottejos/merelcoin,joulecoin/joulecoin,ivansib/sibcoin,ArgonToken/ArgonToken,presstab/PIVX,crowning-/dash,mycointest/owncoin,okinc/bitcoin,midnight-miner/LasVegasCoin,Bloom-Project/Bloom,OmniLayer/omnicore,capitalDIGI/DIGI-v-0-10-4,mycointest/owncoin,florincoin/florincoin,Mrs-X/Darknet,Mrs-X/Darknet,diggcoin/diggcoin,crowning-/dash,willwray/dash,projectinterzone/ITZ,oklink-dev/bitcoin,CoinProjects/AmsterdamCoin-v4,ingresscoin/ingresscoin,BlockchainTechLLC/3dcoin,antcheck/antcoin,Mrs-X/PIVX,Electronic-Gulden-Foundation/egulden,mockcoin/mockcoin,aspirecoin/aspire,PIVX-Project/PIVX,Vsync-project/Vsync,terracoin/terracoin,benzmuircroft/REWIRE.io,worldbit/worldbit,capitalDIGI/DIGI-v-0-10-4,inkvisit/sarmacoins,xuyangcn/opalcoin,alejandromgk/Lunar,Darknet-Crypto/Darknet,jmgilbert2/energi,okinc/bitcoin,npccoin/npccoin,willwray/dash,apoelstra/elements,joulecoin/joulecoin,pascalguru/florincoin,tropa/axecoin,pinkevich/dash,Rav3nPL/doubloons-0.10,genavarov/lamacoin,nmarley/dash,diggcoin/diggcoin,MazaCoin/mazacoin-new,HeliumGas/helium,kleetus/bitcoinxt,capitalDIGI/DIGI-v-0-10-4,dmrtsvetkov/flowercoin,apoelstra/elements,midnight-miner/LasVegasCoin,fullcoins/fullcoin,genavarov/lamacoin,PandaPayProject/PandaPay,cerebrus29301/crowncoin,KibiCoin/kibicoin,truthcoin/blocksize-market,BlockchainTechLLC/3dcoin,genavarov/brcoin,slingcoin/sling-market,NunoEdgarGub1/elements,CoinProjects/AmsterdamCoin-v4,upgradeadvice/MUE-Src,freelion93/mtucicoin,pinkevich/dash,lakepay/lake,octocoin-project/octocoin,rdqw/sscoin,DMDcoin/Diamond,antcheck/antcoin,OmniLayer/omnicore,jmgilbert2/energi,Kenwhite23/litecoin,ingresscoin/ingresscoin,ptschip/bitcoinxt,GwangJin/gwangmoney-core,antcheck/antcoin,octocoin-project/octocoin,RyanLucchese/energi,worldbit/worldbit,ahmedbodi/test2,fullcoins/fullcoin,MazaCoin/maza,MonetaryUnit/MUE-Src,mockcoin/mockcoin,jtimon/elements,apoelstra/elements,putinclassic/putic,RyanLucchese/energi,aspirecoin/aspire,ahmedbodi/test2,genavarov/lamacoin,worldbit/worldbit,ivansib/sibcoin,ivansib/sibcoin,PandaPayProject/PandaPay,alejandromgk/Lunar,my-first/octocoin,mockcoin/mockcoin,presstab/PIVX,pelorusjack/BlockDX,Mrs-X/Darknet,florincoin/florincoin,RyanLucchese/energi,aburan28/elements,ptschip/bitcoinxt,okinc/bitcoin,RibbitFROG/ribbitcoin,alejandromgk/Lunar,capitalDIGI/litecoin,puticcoin/putic,Bloom-Project/Bloom,coinkeeper/2015-06-22_18-52_viacoin,rdqw/sscoin,capitalDIGI/litecoin,RyanLucchese/energi,fussl/elements,presstab/PIVX,keesdewit82/LasVegasCoin,kleetus/bitcoinxt,benzmuircroft/REWIRE.io,inkvisit/sarmacoins,oklink-dev/bitcoin,putinclassic/putic,midnight-miner/LasVegasCoin,coinkeeper/2015-06-22_18-52_viacoin,DynamicCoinOrg/DMC,joulecoin/joulecoin,nmarley/dash,NunoEdgarGub1/elements,Petr-Economissa/gvidon,fussl/elements,RyanLucchese/energi,LIMXTEC/DMDv3,projectinterzone/ITZ,RibbitFROG/ribbitcoin,biblepay/biblepay,crowning-/dash,KibiCoin/kibicoin,MonetaryUnit/MUE-Src,PIVX-Project/PIVX,UdjinM6/dash,crowning-/dash,crowning-/dash,joulecoin/joulecoin,ediston/energi,sipa/elements,projectinterzone/ITZ,ArgonToken/ArgonToken,koharjidan/litecoin,genavarov/brcoin,mikehearn/bitcoinxt,ticclassic/ic,KibiCoin/kibicoin,genavarov/ladacoin,florincoin/florincoin,slingcoin/sling-market,tropa/axecoin,ivansib/sibcoin,ivansib/sib16,apoelstra/elements,ingresscoin/ingresscoin,MazaCoin/mazacoin-new,coinkeeper/2015-06-22_18-52_viacoin,upgradeadvice/MUE-Src,xuyangcn/opalcoin,PIVX-Project/PIVX,my-first/octocoin,truthcoin/blocksize-market,jtimon/elements,RibbitFROG/ribbitcoin,genavarov/ladacoin,freelion93/mtucicoin,dmrtsvetkov/flowercoin,willwray/dash,jtimon/elements,xuyangcn/opalcoin,Darknet-Crypto/Darknet,UdjinM6/dash,Electronic-Gulden-Foundation/egulden,CoinProjects/AmsterdamCoin-v4,capitalDIGI/litecoin,Thracky/monkeycoin,truthcoin/blocksize-market,ColossusCoinXT/ColossusCoinXT,my-first/octocoin,rdqw/sscoin,MonetaryUnit/MUE-Src,npccoin/npccoin,MonetaryUnit/MUE-Src,droark/elements,presstab/PIVX,xawksow/GroestlCoin,diggcoin/diggcoin,alejandromgk/Lunar,schinzelh/dash,pinkevich/dash,npccoin/npccoin,Thracky/monkeycoin,xawksow/GroestlCoin,CoinProjects/AmsterdamCoin-v4,OstlerDev/florincoin,benzmuircroft/REWIRE.io,ivansib/sib16,OmniLayer/omnicore,PandaPayProject/PandaPay,lakepay/lake,Thracky/monkeycoin,DMDcoin/Diamond,nmarley/dash,presstab/PIVX,truthcoin/blocksize-market,PIVX-Project/PIVX,inkvisit/sarmacoins,keesdewit82/LasVegasCoin,Mrs-X/PIVX,puticcoin/putic,alejandromgk/Lunar,ColossusCoinXT/ColossusCoinXT,florincoin/florincoin,droark/elements,koharjidan/litecoin,pascalguru/florincoin,thelazier/dash,Darknet-Crypto/Darknet,Petr-Economissa/gvidon,freelion93/mtucicoin,nmarley/dash,Electronic-Gulden-Foundation/egulden,dashpay/dash,axelxod/braincoin,LIMXTEC/DMDv3,capitalDIGI/litecoin,mapineda/litecoin,MonetaryUnit/MUE-Src,mockcoin/mockcoin,MazaCoin/maza,cerebrus29301/crowncoin,ionomy/ion,dashpay/dash,Petr-Economissa/gvidon,freelion93/mtucicoin,cerebrus29301/crowncoin,inkvisit/sarmacoins,keesdewit82/LasVegasCoin,sipa/elements,kleetus/bitcoinxt,xawksow/GroestlCoin,koharjidan/litecoin,ivansib/sibcoin,NunoEdgarGub1/elements,thelazier/dash,OstlerDev/florincoin,diggcoin/diggcoin,ArgonToken/ArgonToken,mikehearn/bitcoinxt,DMDcoin/Diamond,my-first/octocoin,UdjinM6/dash,BlockchainTechLLC/3dcoin,MazaCoin/maza,genavarov/brcoin,octocoin-project/octocoin,OstlerDev/florincoin,genavarov/brcoin,sipa/elements,axelxod/braincoin,dev1972/Satellitecoin,ivansib/sib16,HeliumGas/helium,sipa/elements,diggcoin/diggcoin,ivansib/sibcoin,HeliumGas/helium,zottejos/merelcoin,joulecoin/joulecoin,freelion93/mtucicoin,willwray/dash,Petr-Economissa/gvidon,ahmedbodi/test2,KibiCoin/kibicoin,jtimon/elements,ColossusCoinXT/ColossusCoinXT,Electronic-Gulden-Foundation/egulden,pstratem/elements,terracoin/terracoin,rsdevgun16e/energi,projectinterzone/ITZ,ptschip/bitcoinxt,mycointest/owncoin,freelion93/mtucicoin,OstlerDev/florincoin,PIVX-Project/PIVX,grumpydevelop/singularity,pinkevich/dash,genavarov/lamacoin,Rav3nPL/doubloons-0.10,PandaPayProject/PandaPay,rsdevgun16e/energi,ColossusCoinXT/ColossusCoinXT,ivansib/sib16,OmniLayer/omnicore,Thracky/monkeycoin,Bloom-Project/Bloom,fussl/elements,ivansib/sib16,fussl/elements,dashpay/dash,sipa/elements,gwillen/elements,inkvisit/sarmacoins,pelorusjack/BlockDX,terracoin/terracoin,Darknet-Crypto/Darknet,Darknet-Crypto/Darknet,cerebrus29301/crowncoin,Mrs-X/PIVX,dashpay/dash,upgradeadvice/MUE-Src,dev1972/Satellitecoin,MonetaryUnit/MUE-Src,npccoin/npccoin,Mrs-X/Darknet,genavarov/ladacoin,grumpydevelop/singularity,DMDcoin/Diamond,droark/elements,Petr-Economissa/gvidon,dev1972/Satellitecoin,capitalDIGI/DIGI-v-0-10-4,aburan28/elements,rdqw/sscoin,pelorusjack/BlockDX,puticcoin/putic,pascalguru/florincoin,dmrtsvetkov/flowercoin,NunoEdgarGub1/elements,Vsync-project/Vsync,koharjidan/litecoin,zottejos/merelcoin,pinkevich/dash,okinc/bitcoin,jmgilbert2/energi,DynamicCoinOrg/DMC,slingcoin/sling-market,48thct2jtnf/P,dev1972/Satellitecoin,keesdewit82/LasVegasCoin,slingcoin/sling-market,putinclassic/putic,Mrs-X/Darknet,antcheck/antcoin,apoelstra/elements,pascalguru/florincoin,ticclassic/ic,coinkeeper/2015-06-22_18-52_viacoin,KibiCoin/kibicoin,Rav3nPL/doubloons-0.10,Bloom-Project/Bloom,LIMXTEC/DMDv3,gwillen/elements,ticclassic/ic,benzmuircroft/REWIRE.io,slingcoin/sling-market,genavarov/ladacoin,BlockchainTechLLC/3dcoin,upgradeadvice/MUE-Src,grumpydevelop/singularity,crowning-/dash,pstratem/elements,schinzelh/dash,koharjidan/litecoin,aspirecoin/aspire,keesdewit82/LasVegasCoin,mapineda/litecoin,grumpydevelop/singularity,slingcoin/sling-market,biblepay/biblepay,ediston/energi,pstratem/elements,OmniLayer/omnicore,genavarov/brcoin,rdqw/sscoin,my-first/octocoin,cerebrus29301/crowncoin,nmarley/dash,mockcoin/mockcoin,aburan28/elements,48thct2jtnf/P,pascalguru/florincoin,DynamicCoinOrg/DMC,ediston/energi,koharjidan/litecoin,pelorusjack/BlockDX,MazaCoin/mazacoin-new,ticclassic/ic,tropa/axecoin,capitalDIGI/litecoin,benzmuircroft/REWIRE.io,ionomy/ion,RyanLucchese/energi,midnight-miner/LasVegasCoin,willwray/dash,PIVX-Project/PIVX,midnight-miner/LasVegasCoin,tropa/axecoin,Vsync-project/Vsync,pinkevich/dash,PandaPayProject/PandaPay,pstratem/elements,oklink-dev/bitcoin,dev1972/Satellitecoin,genavarov/lamacoin,48thct2jtnf/P,PandaPayProject/PandaPay,kleetus/bitcoinxt,MazaCoin/mazacoin-new,Bloom-Project/Bloom,dmrtsvetkov/flowercoin,fussl/elements,aburan28/elements,axelxod/braincoin,xuyangcn/opalcoin,diggcoin/diggcoin,gwillen/elements,dmrtsvetkov/flowercoin,KibiCoin/kibicoin,Rav3nPL/doubloons-0.10,jmgilbert2/energi,ticclassic/ic,GwangJin/gwangmoney-core,LIMXTEC/DMDv3,Kenwhite23/litecoin,48thct2jtnf/P,ediston/energi,pelorusjack/BlockDX,inkvisit/sarmacoins,ColossusCoinXT/ColossusCoinXT,DynamicCoinOrg/DMC,florincoin/florincoin,DMDcoin/Diamond,RibbitFROG/ribbitcoin,Vsync-project/Vsync,48thct2jtnf/P,oklink-dev/bitcoin,truthcoin/blocksize-market,Kenwhite23/litecoin,mikehearn/bitcoinxt,NunoEdgarGub1/elements,okinc/bitcoin,NunoEdgarGub1/elements,sipa/elements,Kenwhite23/litecoin,Mrs-X/PIVX,axelxod/braincoin,midnight-miner/LasVegasCoin,ionomy/ion,aspirecoin/aspire,GwangJin/gwangmoney-core,mapineda/litecoin,axelxod/braincoin,terracoin/terracoin,lakepay/lake,ArgonToken/ArgonToken,RibbitFROG/ribbitcoin,puticcoin/putic,LIMXTEC/DMDv3,jmgilbert2/energi,kleetus/bitcoinxt,puticcoin/putic,dashpay/dash,jtimon/elements,ahmedbodi/test2,aspirecoin/aspire,MazaCoin/maza,nmarley/dash,jtimon/elements,worldbit/worldbit,Kenwhite23/litecoin,Darknet-Crypto/Darknet,Vsync-project/Vsync,fullcoins/fullcoin,dmrtsvetkov/flowercoin,mapineda/litecoin,Mrs-X/Darknet,kleetus/bitcoinxt,joulecoin/joulecoin,jmgilbert2/energi,Mrs-X/PIVX,octocoin-project/octocoin,Electronic-Gulden-Foundation/egulden,schinzelh/dash,zottejos/merelcoin,ediston/energi,pstratem/elements,oklink-dev/bitcoin,gwillen/elements,HeliumGas/helium,ArgonToken/ArgonToken,UdjinM6/dash,MazaCoin/mazacoin-new,axelxod/braincoin,tropa/axecoin,thelazier/dash,octocoin-project/octocoin,xuyangcn/opalcoin,putinclassic/putic,ionomy/ion,putinclassic/putic,keesdewit82/LasVegasCoin,npccoin/npccoin,octocoin-project/octocoin,biblepay/biblepay,upgradeadvice/MUE-Src,Vsync-project/Vsync,pascalguru/florincoin,mapineda/litecoin,cerebrus29301/crowncoin,Kenwhite23/litecoin,xawksow/GroestlCoin,terracoin/terracoin,lakepay/lake,biblepay/biblepay,schinzelh/dash,LIMXTEC/DMDv3,presstab/PIVX,genavarov/ladacoin,aspirecoin/aspire,DynamicCoinOrg/DMC,ptschip/bitcoinxt,biblepay/biblepay,terracoin/terracoin,PIVX-Project/PIVX