[ASNetworkImageNode] Fix threading issue in current image quality
[ASNetworkImageNode] Fix threading issue in current image quality

Summary:
Because we trampoline to main when setting _currentImageQuality, there would be situations where displayWillStart was called, we get a cached image and set currentImageQuality to 1.0, and then a background thread calling setDefaultImage would enqueue an operation that sets currentImageQuality to 0 and overwrites the correct value
bimawa/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,smyrgl/AsyncDisplayKit,Xinchi/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,JetZou/AsyncDisplayKit,smyrgl/AsyncDisplayKit,george-gw/AsyncDisplayKit,levi/AsyncDisplayKit,flovouin/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,rmls/AsyncDisplayKit,smyrgl/AsyncDisplayKit,lappp9/AsyncDisplayKit,maicki/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,flovouin/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,Xinchi/AsyncDisplayKit,flovouin/AsyncDisplayKit,Xinchi/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,bimawa/AsyncDisplayKit,bimawa/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,bimawa/AsyncDisplayKit,Xinchi/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,smyrgl/AsyncDisplayKit,rmls/AsyncDisplayKit,george-gw/AsyncDisplayKit,samhsiung/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,JetZou/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,lappp9/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,gazreese/AsyncDisplayKit,flovouin/AsyncDisplayKit,maicki/AsyncDisplayKit,rmls/AsyncDisplayKit,harryworld/AsyncDisplayKit,romyilano/AsyncDisplayKit,JetZou/AsyncDisplayKit,gazreese/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,yufenglv/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,yufenglv/AsyncDisplayKit,lappp9/AsyncDisplayKit,facebook/AsyncDisplayKit,facebook/AsyncDisplayKit,yufenglv/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,levi/AsyncDisplayKit,yufenglv/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,george-gw/AsyncDisplayKit,levi/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,maicki/AsyncDisplayKit,yufenglv/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,levi/AsyncDisplayKit,maicki/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,facebook/AsyncDisplayKit,harryworld/AsyncDisplayKit,harryworld/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,facebook/AsyncDisplayKit,flovouin/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,samhsiung/AsyncDisplayKit,samhsiung/AsyncDisplayKit,rmls/AsyncDisplayKit,harryworld/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,JetZou/AsyncDisplayKit,gazreese/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,Xinchi/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,lappp9/AsyncDisplayKit,george-gw/AsyncDisplayKit,JetZou/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,levi/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,harryworld/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,romyilano/AsyncDisplayKit,romyilano/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,maicki/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,samhsiung/AsyncDisplayKit,rmls/AsyncDisplayKit,gazreese/AsyncDisplayKit,romyilano/AsyncDisplayKit