Collect average rating and review count in a single query to avoid races. (bug 893335, bug 897968)
Collect average rating and review count in a single query to avoid races. (bug 893335, bug 897968)

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