Makes icon tests more portable. Failing for me because dev server host was different?
Makes icon tests more portable. Failing for me because dev server host was different?

Note also that get_icon_url() has its own tests elsewhere.

mozilla/addons-server,koehlermichael/olympia,Witia1/olympia,bqbn/addons-server,crdoconnor/olympia,crdoconnor/olympia,andymckay/addons-server,mrrrgn/olympia,tsl143/zamboni,mdaif/olympia,tsl143/addons-server,clouserw/zamboni,jpetto/olympia,mrrrgn/olympia,wagnerand/zamboni,luckylavish/zamboni,mrrrgn/olympia,clouserw/zamboni,mudithkr/zamboni,elysium001/zamboni,robhudson/zamboni,ayushagrawal288/zamboni,aviarypl/mozilla-l10n-addons-server,jpetto/olympia,elysium001/zamboni,jamesthechamp/zamboni,yfdyh000/olympia,muffinresearch/olympia,ddurst/zamboni,spasovski/zamboni,johancz/olympia,mdaif/olympia,diox/zamboni,yfdyh000/olympia,magopian/olympia,Prashant-Surya/addons-server,diox/zamboni,andymckay/addons-server,kumar303/olympia,diox/olympia,kumar303/addons-server,mrrrgn/olympia,andymckay/zamboni,Hitechverma/zamboni,wagnerand/addons-server,koehlermichael/olympia,johancz/olympia,Joergen/olympia,psiinon/addons-server,psiinon/addons-server,Jobava/zamboni,bqbn/addons-server,wagnerand/addons-server,kumar303/addons-server,elysium001/zamboni,SuriyaaKudoIsc/olympia,Witia1/olympia,washort/zamboni,tsl143/zamboni,crdoconnor/olympia,tsl143/addons-server,Joergen/zamboni,atiqueahmedziad/addons-server,Joergen/olympia,mstriemer/zamboni,ingenioustechie/zamboni,wagnerand/zamboni,ayushagrawal288/zamboni,spasovski/zamboni,andymckay/olympia,mstriemer/addons-server,mozilla/zamboni,beni55/olympia,eviljeff/olympia,diox/olympia,kmaglione/olympia,Joergen/olympia,jasonthomas/zamboni,SuriyaaKudoIsc/olympia,robhudson/zamboni,anaran/olympia,ingenioustechie/zamboni,mstriemer/olympia,mstriemer/zamboni,ddurst/zamboni,jpetto/olympia,harry-7/addons-server,jbalogh/zamboni,mdaif/olympia,kumar303/olympia,mozilla/olympia,Jobava/zamboni,mozilla/addons-server,Hitechverma/zamboni,mrrrgn/olympia,diox/olympia,atiqueahmedziad/addons-server,Revanth47/addons-server,kumar303/zamboni,SuriyaaKudoIsc/olympia,muffinresearch/addons-server,mdaif/olympia,beni55/olympia,tsl143/zamboni,washort/zamboni,muffinresearch/olympia,Hitechverma/zamboni,eviljeff/olympia,eviljeff/olympia,diox/zamboni,yfdyh000/olympia,harry-7/addons-server,jamesthechamp/zamboni,lavish205/olympia,Nolski/olympia,johancz/olympia,kumar303/addons-server,beni55/olympia,beni55/olympia,jasonthomas/zamboni,shahbaz17/zamboni,kumar303/zamboni,ayushagrawal288/zamboni,harikishen/addons-server,mdaif/olympia,ddurst/zamboni,lavish205/olympia,Hitechverma/zamboni,mstriemer/addons-server,jpetto/olympia,mozilla/olympia,magopian/olympia,spasovski/zamboni,kumar303/zamboni,harikishen/addons-server,eviljeff/zamboni,kmaglione/olympia,atiqueahmedziad/addons-server,muffinresearch/olympia,wagnerand/olympia,muffinresearch/olympia,Joergen/zamboni,Revanth47/addons-server,luckylavish/zamboni,johancz/olympia,johancz/olympia,robhudson/zamboni,diox/zamboni,jbalogh/zamboni,andymckay/addons-server,jbalogh/zamboni,jasonthomas/zamboni,andymckay/zamboni,kmaglione/olympia,ingenioustechie/zamboni,andymckay/zamboni,mstriemer/zamboni,kumar303/addons-server,psiinon/addons-server,aviarypl/mozilla-l10n-addons-server,aviarypl/mozilla-l10n-addons-server,wagnerand/addons-server,mozilla/addons-server,luckylavish/zamboni,Jobava/zamboni,crdoconnor/olympia,crdoconnor/olympia,spasovski/zamboni,ddurst/zamboni,Prashant-Surya/addons-server,harikishen/addons-server,lavish205/olympia,Joergen/zamboni,Nolski/olympia,shahbaz17/zamboni,clouserw/zamboni,psiinon/addons-server,kumar303/zamboni,magopian/olympia,muffinresearch/olympia,bqbn/addons-server,eviljeff/olympia,Witia1/olympia,bqbn/addons-server,jasonthomas/zamboni,jamesthechamp/zamboni,muffinresearch/addons-server,harry-7/addons-server,Witia1/olympia,kumar303/olympia,beni55/olympia,Joergen/olympia,mozilla/zamboni,wagnerand/zamboni,lavish205/olympia,magopian/olympia,shahbaz17/zamboni,Witia1/olympia,washort/zamboni,Joergen/zamboni,koehlermichael/olympia,mstriemer/olympia,wagnerand/olympia,ngokevin/zamboni,koehlermichael/olympia,andymckay/olympia,Nolski/olympia,yfdyh000/olympia,andymckay/olympia,shahbaz17/zamboni,atiqueahmedziad/addons-server,eviljeff/zamboni,anaran/olympia,Jobava/zamboni,jbalogh/zamboni,washort/zamboni,Joergen/olympia,yfdyh000/olympia,tsl143/addons-server,mozilla/olympia,robhudson/zamboni,kumar303/olympia,mozilla/zamboni,andymckay/addons-server,magopian/olympia,harikishen/addons-server,ngokevin/zamboni,wagnerand/olympia,eviljeff/zamboni,mstriemer/olympia,tsl143/zamboni,mstriemer/addons-server,mstriemer/addons-server,tsl143/addons-server,ayushagrawal288/zamboni,wagnerand/addons-server,andymckay/olympia,mudithkr/zamboni,SuriyaaKudoIsc/olympia,muffinresearch/addons-server,mozilla/olympia,Prashant-Surya/addons-server,mudithkr/zamboni,luckylavish/zamboni,anaran/olympia,mstriemer/zamboni,wagnerand/zamboni,jamesthechamp/zamboni,elysium001/zamboni,Prashant-Surya/addons-server,mozilla/zamboni,eviljeff/zamboni,aviarypl/mozilla-l10n-addons-server,Revanth47/addons-server,harry-7/addons-server,ngokevin/zamboni,muffinresearch/addons-server,diox/olympia,Nolski/olympia,kmaglione/olympia,mudithkr/zamboni,Joergen/za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