Set LD_LIBRARY_PATH consistently in travis tests
Set LD_LIBRARY_PATH consistently in travis tests

Remove inconsistency between functional and unit test environments and make it
possible to substitute bitcoin-qt and bitcoin-node in place of bitcoind in
python tests, or to link bitcoind against shared libraries.

fujicoin/fujicoin,particl/particl-core,lateminer/bitcoin,EthanHeilman/bitcoin,anditto/bitcoin,mruddy/bitcoin,jonasschnelli/bitcoin,qtumproject/qtum,Xekyo/bitcoin,midnightmagic/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,qtumproject/qtum,GroestlCoin/bitcoin,MeshCollider/bitcoin,sipsorcery/bitcoin,yenliangl/bitcoin,fujicoin/fujicoin,GroestlCoin/bitcoin,jonasschnelli/bitcoin,namecoin/namecore,midnightmagic/bitcoin,sipsorcery/bitcoin,bitcoinsSG/bitcoin,mruddy/bitcoin,pataquets/namecoin-core,anditto/bitcoin,instagibbs/bitcoin,andreaskern/bitcoin,tecnovert/particl-core,AkioNak/bitcoin,kallewoof/bitcoin,apoelstra/bitcoin,pstratem/bitcoin,GroestlCoin/GroestlCoin,practicalswift/bitcoin,bitcoinknots/bitcoin,namecoin/namecore,rnicoll/dogecoin,ElementsProject/elements,achow101/bitcoin,tecnovert/particl-core,namecoin/namecore,litecoin-project/litecoin,Sjors/bitcoin,mruddy/bitcoin,MarcoFalke/bitcoin,jnewbery/bitcoin,particl/particl-core,qtumproject/qtum,jlopp/statoshi,kallewoof/bitcoin,pstratem/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,mm-s/bitcoin,practicalswift/bitcoin,yenliangl/bitcoin,mruddy/bitcoin,mruddy/bitcoin,domob1812/bitcoin,andreaskern/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,EthanHeilman/bitcoin,fujicoin/fujicoin,fanquake/bitcoin,tecnovert/particl-core,MarcoFalke/bitcoin,achow101/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,GroestlCoin/GroestlCoin,fujicoin/fujicoin,lateminer/bitcoin,domob1812/namecore,alecalve/bitcoin,fanquake/bitcoin,particl/particl-core,EthanHeilman/bitcoin,jlopp/statoshi,litecoin-project/litecoin,kallewoof/bitcoin,anditto/bitcoin,lateminer/bitcoin,bitcoinknots/bitcoin,litecoin-project/litecoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,sipsorcery/bitcoin,JeremyRubin/bitcoin,bitcoin/bitcoin,apoelstra/bitcoin,instagibbs/bitcoin,sstone/bitcoin,MeshCollider/bitcoin,practicalswift/bitcoin,mm-s/bitcoin,litecoin-project/litecoin,midnightmagic/bitcoin,cdecker/bitcoin,domob1812/namecore,sstone/bitcoin,ajtowns/bitcoin,mm-s/bitcoin,midnightmagic/bitcoin,jambolo/bitcoin,ajtowns/bitcoin,ElementsProject/elements,MeshCollider/bitcoin,practicalswift/bitcoin,Sjors/bitcoin,GroestlCoin/bitcoin,alecalve/bitcoin,andreaskern/bitcoin,jnewbery/bitcoin,jonasschnelli/bitcoin,sstone/bitcoin,GroestlCoin/bitcoin,JeremyRubin/bitcoin,domob1812/namecore,qtumproject/qtum,achow101/bitcoin,sipsorcery/bitcoin,litecoin-project/litecoin,yenliangl/bitcoin,MarcoFalke/bitcoin,mruddy/bitcoin,AkioNak/bitcoin,pataquets/namecoin-core,anditto/bitcoin,jonasschnelli/bitcoin,JeremyRubin/bitcoin,jamesob/bitcoin,cdecker/bitcoin,namecoin/namecore,kallewoof/bitcoin,qtumproject/qtum,instagibbs/bitcoin,AkioNak/bitcoin,fujicoin/fujicoin,EthanHeilman/bitcoin,jambolo/bitcoin,jlopp/statoshi,andreaskern/bitcoin,rnicoll/dogecoin,achow101/bitcoin,jnewbery/bitcoin,jlopp/statoshi,domob1812/bitcoin,namecoin/namecoin-core,AkioNak/bitcoin,bitcoinknots/bitcoin,cdecker/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,ElementsProject/elements,fujicoin/fujicoin,GroestlCoin/bitcoin,mm-s/bitcoin,domob1812/bitcoin,andreaskern/bitcoin,pataquets/namecoin-core,lateminer/bitcoin,dscotese/bitcoin,qtumproject/qtum,jamesob/bitcoin,alecalve/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,particl/particl-core,bitcoinknots/bitcoin,GroestlCoin/GroestlCoin,sstone/bitcoin,lateminer/bitcoin,particl/particl-core,lateminer/bitcoin,alecalve/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,tecnovert/particl-core,dscotese/bitcoin,apoelstra/bitcoin,anditto/bitcoin,jonasschnelli/bitcoin,MeshCollider/bitcoin,prusnak/bitcoin,pstratem/bitcoin,prusnak/bitcoin,rnicoll/dogecoin,mm-s/bitcoin,alecalve/bitcoin,dscotese/bitcoin,MarcoFalke/bitcoin,Xekyo/bitcoin,fanquake/bitcoin,jambolo/bitcoin,EthanHeilman/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,particl/particl-core,pataquets/namecoin-core,instagibbs/bitcoin,jamesob/bitcoin,namecoin/namecoin-core,n1bor/bitcoin,sstone/bitcoin,rnicoll/bitcoin,jlopp/statoshi,midnightmagic/bitcoin,dscotese/bitcoin,bitcoinsSG/bitcoin,cdecker/bitcoin,qtumproject/qtum,rnicoll/bitcoin,namecoin/namecoin-core,alecalve/bitcoin,pataquets/namecoin-core,MeshCollider/bitcoin,bitcoinsSG/bitcoin,dscotese/bitcoin,rnicoll/bitcoin,pstratem/bitcoin,Sjors/bitcoin,MeshCollider/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,AkioNak/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,cdecker/bitcoin,practicalswift/bitcoin,n1bor/bitcoin,domob1812/bitcoin,prusnak/bitcoin,namecoin/namecore,ajtowns/bitcoin,tecnovert/particl-core,JeremyRubin/bitcoin,n1bor/bitcoin,jambolo/bitcoin,bitcoin/bitcoin,yenliangl/bitcoin,kallewoof/bitcoin,anditto/bitcoin,ElementsProject/elements,ElementsProject/elements,achow101/bitcoin,JeremyRubin/bitcoin,bitcoin/bitcoin,bitcoin/bitcoin,sstone/bitcoin,JeremyRubin/bitcoin,litecoin-project/litecoin,prusnak/bitcoin,yenliangl/bitcoin,n1bor/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,rnicoll/bitcoin,domob1812/namecore,yenliangl/bitcoin,pstratem/bitcoin,apoelstra/bitcoin,namecoin/namecore,sipsorcery/bitcoin,rnicoll/dogecoin,MarcoFalke/bitcoin,domob1812/namecore,jamesob/bitcoin,rnicoll/dogecoin,rnicoll/bitcoin,ajtowns/bitcoin,pstratem/bitcoin,ElementsProject/elements,Sjors/bitcoin,n1bor/bitcoin,sipsorcery/bitcoin,prusnak/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,EthanHeilman/bitcoin,jnewbery/bitcoin,bitcoin/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,jambolo/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,namecoin/namecoin-core,GroestlCoin/bitcoin,jlopp/statoshi,jnewbery/bitcoin,bitcoinsSG/bitcoin,dscotese/bitcoin,Sjors/bitcoin,jamesob/bitcoin,ajtowns/bitcoin,n1bor/bitcoin,midnightmagic/bitcoin,mm-s/bitcoin,jambolo/bitcoin,fanquake/bitcoin,rnicoll/bitcoin,practicalswift/bitcoin,prusnak/bitcoin