hack HTTPClient to enable proxy integration tests
hack HTTPClient to enable proxy integration tests

HTTPClient considers "localhost" to always be on a no-proxy list, thus
disabling our attempts to have integration tests on localhost. We
override its NO_PROXY_HOSTS constant during tests.

engineyard/faraday,zhaoxl/faraday,zanker/faraday,davidcornu/faraday,lostisland/faraday,apepper/faraday,luvtechno/faraday,davoclavo/faraday,mehulkar/faraday,hrysd/faraday,spyofchina/faraday,iamjarvo/faraday,ngpestelos/faraday,hstrowd/faraday,ngpestelos/faraday,customink/faraday,zanker/faraday,apepper/faraday,mehulkar/faraday,davoclavo/faraday,lostisland/faraday,hrysd/faraday,coinbase/faraday,stayhero/faraday,jhass/faraday,grosser/faraday,ekampp/faraday,spyofchina/faraday,mauricionr/faraday,stayhero/faraday,luvtechno/faraday,santiagodoldan/faraday,hstrowd/faraday,jrafanie/faraday,pvdb/faraday,AvaelKross/faraday,daviswahl/faraday,AvaelKross/faraday,pvdb/faraday,O-I/faraday,santiagodoldan/faraday,ru-faraon/Faraday-is-an-HTTP-client,jhass/faraday,prcongithub/faraday,davidcornu/faraday,O-I/faraday,mauricionr/faraday,flower-pot/faraday,flower-pot/faraday,nevans/faraday,daviswahl/faraday,nevans/faraday,prcongithub/faraday,grosser/faraday,zhaoxl/faraday,customink/faraday,ru-faraon/Faraday-is-an-HTTP-client,iamjarvo/faraday,coinbase/faraday,engineyard/faraday,ekampp/faraday,jrafanie/faraday