Add defaults for CORS related django settings that can be overwritten.
Add defaults for CORS related django settings that can be overwritten.

stvstnfrd/configuration,stvstnfrd/configuration,nikolas/configuration,kursitet/configuration,Livit/Livit.Learn.EdX.configuration,edx/configuration,antoviaque/configuration,hastexo/edx-configuration,jorgeomarmh/configuration,bugcy013/edx_infra,glengal/configuration,armaan/edx-configuration,nikolas/configuration,hastexo/edx-configuration,CredoReference/configuration,proversity-org/configuration,louyihua/configuration,yrchen/configuration,kencung/configuration,rue89-tech/configuration,pedrorib/istx,IndonesiaX/configuration,openfun/configuration,AlfiyaZi/configuration,yrchen/configuration,omarkhan/configuration,lgfa29/configuration,xiangjf/configuration,jorgeomarmh/configuration,beacloudgenius/configuration,Softmotions/configuration,hks-epod/configuration,EDUlib/configuration,gashac03/ubuntu,IndonesiaX/configuration,pobrejuanito/configuration,pedrorib/istx,kencung/configuration,Softmotions/configuration,alu042/configuration,Livit/Livit.Learn.EdX.configuration,rue89-tech/configuration,jorgeomarmh/configuration,joshhu/configuration,louyihua/configuration,antshin72/configuration,pobrejuanito/configuration,omarkhan/configuration,armaan/edx-configuration,4eek/configuration,arbrandes/edx-configuration,nunpa/configuration,jp-bpl/configuration,kursitet/configuration,antoviaque/configuration,4eek/configuration,appsembler/configuration,vasyarv/configuration,gsehub/configuration,beacloudgenius/configuration,cyanna/configuration,openfun/configuration,hastexo/edx-configuration-old,AlfiyaZi/configuration,antoviaque/configuration,IndonesiaX/configuration,glengal/configuration,beacloudgenius/configuration,nttks/configuration,Pieros/configuration,rue89-tech/configuration,gashac03/ubuntu,EDUlib/configuration,Stanford-Online/configuration,gsehub/configuration,mitodl/configuration,Carlos2005/configuration,open-craft/configuration,nikolas/configuration,glengal/configuration,open-craft/configuration,antoviaque/configuration,arbrandes/edx-configuration,Stanford-Online/configuration,marcore/configuration,Stanford-Online/configuration,rue89-tech/configuration,hks-epod/configuration,EDUlib/configuration,nttks/configuration,joshhu/configuration,proversity-org/configuration,vasyarv/configuration,proversity-org/configuration,michaelsteiner19/open-edx-configuration,usernamenumber/configuration,vasyarv/configuration,zhengjunwei/configuration,IndonesiaX/configuration,jp-bpl/configuration,fghaas/edx-configuration,jorgeomarmh/configuration,jp-bpl/configuration,bugcy013/edx_infra,eduStack/configuration,4eek/configuration,CredoReference/configuration,proversity-org/configuration,louyihua/configuration,alu042/configuration,hastexo/edx-configuration-old,cyanna/configuration,Livit/Livit.Learn.EdX.configuration,mitodl/configuration,hastexo/edx-configuration-old,Pieros/configuration,openfun/configuration,open-craft/configuration,edx/configuration,nunpa/configuration,usernamenumber/configuration,Softmotions/configuration,stvstnfrd/configuration,usernamenumber/configuration,hastexo/edx-configuration,antshin72/configuration,arifsetiawan/configuration,joshhu/configuration,AlfiyaZi/configuration,knehez/configuration,kencung/configuration,EDUlib/configuration,AlfiyaZi/configuration,Livit/Livit.Learn.EdX.configuration,arifsetiawan/configuration,fghaas/edx-configuration,leansoft/configuration,cyanna/configuration,bugcy013/edx_infra,gsehub/configuration,edx/configuration,pedrorib/istx,leansoft/configuration,nttks/configuration,armaan/edx-configuration,Pieros/configuration,michaelsteiner19/open-edx-configuration,appsembler/configuration,zhengjunwei/configuration,arbrandes/edx-configuration,glengal/configuration,omarkhan/configuration,zhengjunwei/configuration,eduStack/configuration,michaelsteiner19/open-edx-configuration,alu042/configuration,joshhu/configuration,Carlos2005/configuration,eduStack/configuration,mitodl/configuration,marcore/configuration,knehez/configuration,gashac03/ubuntu,antshin72/configuration,CredoReference/configuration,nikolas/configuration,fghaas/edx-configuration,knehez/configuration,marcore/configuration,beacloudgenius/configuration,stvstnfrd/configuration,knehez/configuration,yrchen/configuration,Stanford-Online/configuration,pobrejuanito/configuration,lgfa29/configuration,louyihua/configuration,michaelsteiner19/open-edx-configuration,open-craft/configuration,jp-bpl/configuration,bugcy013/edx_infra,stvstnfrd/configuration,lgfa29/configuration,pedrorib/istx,Softmotions/configuration,Carlos2005/configuration,xiangjf/configuration,4eek/configuration,Pieros/configuration,xiangjf/configuration,antshin72/configuration,hastexo/edx-configuration-old,mitodl/configuration,nttks/configuration,gsehub/configuration,armaan/edx-configuration,alu042/configuration,hks-epod/configuration,yrchen/configuration,arbrandes/edx-configuration,Stanford-Online/configuration,lgfa29/configuration,zhengjunwei/configuration,hks-epod/configuration,hastexo/edx-configuration,hks-epod/configuration,gsehub/configuration,cyanna/configuration,jp-bpl/configuration,leansoft/c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