Django 1.10: Fix client cache while running tests.
Django 1.10: Fix client cache while running tests.

Django reverts all the changes after running a test but the
client cache retained the deleted value, this caused the
subsequent tests to fail due to invalid foreign key constraints.
This commit fixes the issue by prefixing the cache name in
client cache with KEY_PREFIX which is bounced after every test.

andersk/zulip,Jianchun1/zulip,reyha/zulip,sonali0901/zulip,KingxBanana/zulip,zulip/zulip,PhilSk/zulip,verma-varsha/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,brainwane/zulip,synicalsyntax/zulip,sonali0901/zulip,sonali0901/zulip,Jianchun1/zulip,zacps/zulip,jainayush975/zulip,zulip/zulip,jackrzhang/zulip,mahim97/zulip,niftynei/zulip,sharmaeklavya2/zulip,brainwane/zulip,dhcrzf/zulip,KingxBanana/zulip,tommyip/zulip,aakash-cr7/zulip,aakash-cr7/zulip,zulip/zulip,vabs22/zulip,brockwhittaker/zulip,brainwane/zulip,brockwhittaker/zulip,TigorC/zulip,zacps/zulip,Galexrt/zulip,souravbadami/zulip,cosmicAsymmetry/zulip,vaidap/zulip,eeshangarg/zulip,andersk/zulip,grave-w-grave/zulip,dawran6/zulip,j831/zulip,Galexrt/zulip,andersk/zulip,christi3k/zulip,christi3k/zulip,souravbadami/zulip,sharmaeklavya2/zulip,dhcrzf/zulip,TigorC/zulip,SmartPeople/zulip,jackrzhang/zulip,grave-w-grave/zulip,punchagan/zulip,brainwane/zulip,punchagan/zulip,jrowan/zulip,jainayush975/zulip,ryanbackman/zulip,sharmaeklavya2/zulip,rishig/zulip,shubhamdhama/zulip,timabbott/zulip,jackrzhang/zulip,hackerkid/zulip,dhcrzf/zulip,jphilipsen05/zulip,shubhamdhama/zulip,kou/zulip,vaidap/zulip,rht/zulip,KingxBanana/zulip,jainayush975/zulip,showell/zulip,joyhchen/zulip,Galexrt/zulip,mahim97/zulip,andersk/zulip,mahim97/zulip,dattatreya303/zulip,kou/zulip,Jianchun1/zulip,kou/zulip,eeshangarg/zulip,rishig/zulip,susansls/zulip,AZtheAsian/zulip,amanharitsh123/zulip,calvinleenyc/zulip,Juanvulcano/zulip,dawran6/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,andersk/zulip,susansls/zulip,christi3k/zulip,hackerkid/zulip,calvinleenyc/zulip,zulip/zulip,hackerkid/zulip,jainayush975/zulip,reyha/zulip,Jianchun1/zulip,SmartPeople/zulip,samatdav/zulip,blaze225/zulip,amanharitsh123/zulip,peguin40/zulip,PhilSk/zulip,rht/zulip,rishig/zulip,amyliu345/zulip,KingxBanana/zulip,joyhchen/zulip,SmartPeople/zulip,aakash-cr7/zulip,SmartPeople/zulip,verma-varsha/zulip,sonali0901/zulip,vikas-parashar/zulip,brockwhittaker/zulip,jainayush975/zulip,j831/zulip,cosmicAsymmetry/zulip,rishig/zulip,amyliu345/zulip,verma-varsha/zulip,kou/zulip,AZtheAsian/zulip,vaidap/zulip,zulip/zulip,timabbott/zulip,dhcrzf/zulip,amyliu345/zulip,joyhchen/zulip,AZtheAsian/zulip,sharmaeklavya2/zulip,j831/zulip,rishig/zulip,shubhamdhama/zulip,zacps/zulip,peguin40/zulip,reyha/zulip,Juanvulcano/zulip,joyhchen/zulip,christi3k/zulip,JPJPJPOPOP/zulip,isht3/zulip,susansls/zulip,arpith/zulip,samatdav/zulip,timabbott/zulip,brockwhittaker/zulip,cosmicAsymmetry/zulip,vikas-parashar/zulip,niftynei/zulip,jphilipsen05/zulip,grave-w-grave/zulip,blaze225/zulip,mahim97/zulip,vikas-parashar/zulip,niftynei/zulip,tommyip/zulip,dattatreya303/zulip,christi3k/zulip,jrowan/zulip,tommyip/zulip,brainwane/zulip,AZtheAsian/zulip,PhilSk/zulip,jphilipsen05/zulip,arpith/zulip,reyha/zulip,Diptanshu8/zulip,mahim97/zulip,jphilipsen05/zulip,rht/zulip,ryanbackman/zulip,SmartPeople/zulip,hackerkid/zulip,synicalsyntax/zulip,vikas-parashar/zulip,timabbott/zulip,jainayush975/zulip,aakash-cr7/zulip,kou/zulip,vabs22/zulip,eeshangarg/zulip,jackrzhang/zulip,amyliu345/zulip,shubhamdhama/zulip,souravbadami/zulip,cosmicAsymmetry/zulip,isht3/zulip,brockwhittaker/zulip,punchagan/zulip,SmartPeople/zulip,j831/zulip,tommyip/zulip,amyliu345/zulip,showell/zulip,souravbadami/zulip,christi3k/zulip,zacps/zulip,showell/zulip,dawran6/zulip,jphilipsen05/zulip,arpith/zulip,punchagan/zulip,dawran6/zulip,AZtheAsian/zulip,dhcrzf/zulip,jackrzhang/zulip,rht/zulip,vabs22/zulip,grave-w-grave/zulip,dhcrzf/zulip,synicalsyntax/zulip,blaze225/zulip,sharmaeklavya2/zulip,TigorC/zulip,JPJPJPOPOP/zulip,cosmicAsymmetry/zulip,timabbott/zulip,amanharitsh123/zulip,shubhamdhama/zulip,Diptanshu8/zulip,isht3/zulip,JPJPJPOPOP/zulip,peguin40/zulip,Juanvulcano/zulip,blaze225/zulip,jrowan/zulip,isht3/zulip,grave-w-grave/zulip,vabs22/zulip,vabs22/zulip,ryanbackman/zulip,sonali0901/zulip,Juanvulcano/zulip,Galexrt/zulip,calvinleenyc/zulip,TigorC/zulip,tommyip/zulip,ryanbackman/zulip,KingxBanana/zulip,calvinleenyc/zulip,vabs22/zulip,synicalsyntax/zulip,eeshangarg/zulip,PhilSk/zulip,joyhchen/zulip,grave-w-grave/zulip,dattatreya303/zulip,ryanbackman/zulip,kou/zulip,niftynei/zulip,timabbott/zulip,Juanvulcano/zulip,verma-varsha/zulip,dattatreya303/zulip,showell/zulip,Diptanshu8/zulip,brockwhittaker/zulip,zacps/zulip,souravbadami/zulip,niftynei/zulip,samatdav/zulip,susansls/zulip,aakash-cr7/zulip,PhilSk/zulip,rht/zulip,tommyip/zulip,rht/zulip,reyha/zulip,jrowan/zulip,PhilSk/zulip,zulip/zulip,jackrzhang/zulip,aakash-cr7/zulip,vaidap/zulip,Jianchun1/zulip,tommyip/zulip,sonali0901/zulip,arpith/zulip,susansls/zulip,kou/zulip,niftynei/zulip,jrowan/zulip,amanharitsh123/zulip,punchagan/zulip,blaze225/zulip,zulip/zulip,reyha/zulip,jphilipsen05/zulip,dattatreya303/zulip,peguin40/zulip,hackerkid/zulip,verma-varsha/zulip,vikas-parashar/zulip,joyhchen/zulip,rht/zulip,Galexrt/zulip,brainwane/zulip,j831/zulip,KingxBanana/zulip,samatdav/zulip,Diptanshu8/zulip,JPJPJPOPOP/zulip,rishig/zulip,vaidap/zulip,isht3/zulip,jackrzhang/zulip,rishig/zulip,ryanbackman/zulip,amyliu345/zulip,punchagan/zulip,amanharitsh123/zulip,arpith/zulip,arpith/zulip,andersk/zulip,vikas-parashar/zulip,souravbadami/zulip,showell/zulip,hackerkid/zulip,Diptanshu8/zulip,synicalsyntax/zulip,AZtheAsian/zulip,showell/zulip,dattatreya303/zulip,timabbott/zulip,amanharitsh123/zulip,calvinleenyc/zulip,verma-varsha/zulip,shubhamdhama/zulip,sharmaeklavya2/zulip,eeshangarg/zulip,peguin40/zulip,susansls/zulip,isht3/zulip,samatdav/zulip,calvinleenyc/zulip,dhcrzf/zulip,peguin40/zulip,Juanvulcano/zulip,zacps/zulip,andersk/zulip,dawran6/zulip,Diptanshu8/zulip,synicalsyntax/zulip,Galexrt/zulip,samatdav/zulip,hackerkid/zulip,vaidap/zulip,j831/zulip,dawran6/zulip,jrowan/zulip,punchagan/zulip,shubhamdhama/zulip,blaze225/zulip,brainwane/zulip,Jianchun1/zulip,mahim97/zulip,TigorC/zulip,Galexrt/zulip,TigorC/zulip,showell/zulip,cosmicAsymmetry/zulip