Fix mkt.api.tests.test_base.TestSubRouterWithFormat tests
Fix mkt.api.tests.test_base.TestSubRouterWithFormat tests

DRF apparently made the format slightly more permissive, update
our expected pattern.

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