cache_helpers: Disable filling message cache.
cache_helpers: Disable filling message cache.

The message cache filling script actually used both database and
memcached queries as part of filling the cache (all used to compute
the needed display_recipient values).  We would ideally fix this by
using bulk operations to fill the display_recipient cache, but until
we do so, this cache filler is counterproductive.

I believe this disabling fixes an issue where memcached would get
overloaded and stop handling requests during a server restart on busy
servers.

Galexrt/zulip,susansls/zulip,vaidap/zulip,timabbott/zulip,zulip/zulip,shubhamdhama/zulip,brainwane/zulip,hackerkid/zulip,SmartPeople/zulip,reyha/zulip,shubhamdhama/zulip,SmartPeople/zulip,TigorC/zulip,peguin40/zulip,vikas-parashar/zulip,KingxBanana/zulip,blaze225/zulip,JPJPJPOPOP/zulip,synicalsyntax/zulip,vabs22/zulip,aakash-cr7/zulip,arpith/zulip,AZtheAsian/zulip,tommyip/zulip,grave-w-grave/zulip,rht/zulip,rishig/zulip,Jianchun1/zulip,ahmadassaf/zulip,tommyip/zulip,niftynei/zulip,grave-w-grave/zulip,brockwhittaker/zulip,dawran6/zulip,SmartPeople/zulip,vaidap/zulip,tommyip/zulip,reyha/zulip,zulip/zulip,umkay/zulip,dawran6/zulip,sup95/zulip,niftynei/zulip,PhilSk/zulip,jrowan/zulip,jphilipsen05/zulip,christi3k/zulip,andersk/zulip,dawran6/zulip,j831/zulip,brockwhittaker/zulip,ryanbackman/zulip,dattatreya303/zulip,vaidap/zulip,ryanbackman/zulip,aakash-cr7/zulip,synicalsyntax/zulip,vabs22/zulip,timabbott/zulip,showell/zulip,souravbadami/zulip,PhilSk/zulip,paxapy/zulip,brockwhittaker/zulip,JPJPJPOPOP/zulip,mohsenSy/zulip,sup95/zulip,blaze225/zulip,andersk/zulip,isht3/zulip,joyhchen/zulip,AZtheAsian/zulip,mahim97/zulip,reyha/zulip,amyliu345/zulip,KingxBanana/zulip,cosmicAsymmetry/zulip,krtkmj/zulip,jackrzhang/zulip,zacps/zulip,calvinleenyc/zulip,sonali0901/zulip,Galexrt/zulip,amanharitsh123/zulip,hackerkid/zulip,dattatreya303/zulip,aakash-cr7/zulip,mohsenSy/zulip,sup95/zulip,Juanvulcano/zulip,punchagan/zulip,kou/zulip,amyliu345/zulip,JPJPJPOPOP/zulip,sup95/zulip,vabs22/zulip,KingxBanana/zulip,isht3/zulip,dhcrzf/zulip,sup95/zulip,showell/zulip,amyliu345/zulip,amyliu345/zulip,SmartPeople/zulip,ahmadassaf/zulip,kou/zulip,verma-varsha/zulip,jrowan/zulip,sonali0901/zulip,peguin40/zulip,jphilipsen05/zulip,shubhamdhama/zulip,j831/zulip,isht3/zulip,andersk/zulip,verma-varsha/zulip,Jianchun1/zulip,mahim97/zulip,vaidap/zulip,brainwane/zulip,paxapy/zulip,christi3k/zulip,rishig/zulip,rishig/zulip,kou/zulip,ryanbackman/zulip,kou/zulip,dattatreya303/zulip,andersk/zulip,aakash-cr7/zulip,aakash-cr7/zulip,joyhchen/zulip,vikas-parashar/zulip,brainwane/zulip,ahmadassaf/zulip,rishig/zulip,showell/zulip,sharmaeklavya2/zulip,dhcrzf/zulip,rht/zulip,jphilipsen05/zulip,souravbadami/zulip,Juanvulcano/zulip,jphilipsen05/zulip,krtkmj/zulip,reyha/zulip,amyliu345/zulip,susansls/zulip,jainayush975/zulip,susansls/zulip,mahim97/zulip,showell/zulip,AZtheAsian/zulip,hackerkid/zulip,susansls/zulip,shubhamdhama/zulip,isht3/zulip,KingxBanana/zulip,Juanvulcano/zulip,umkay/zulip,PhilSk/zulip,christi3k/zulip,arpith/zulip,zacps/zulip,TigorC/zulip,dhcrzf/zulip,TigorC/zulip,cosmicAsymmetry/zulip,KingxBanana/zulip,reyha/zulip,umkay/zulip,Diptanshu8/zulip,joyhchen/zulip,joyhchen/zulip,sharmaeklavya2/zulip,jphilipsen05/zulip,peguin40/zulip,cosmicAsymmetry/zulip,susansls/zulip,calvinleenyc/zulip,joyhchen/zulip,AZtheAsian/zulip,showell/zulip,PhilSk/zulip,TigorC/zulip,verma-varsha/zulip,christi3k/zulip,TigorC/zulip,hackerkid/zulip,synicalsyntax/zulip,tommyip/zulip,JPJPJPOPOP/zulip,dhcrzf/zulip,vikas-parashar/zulip,andersk/zulip,vikas-parashar/zulip,shubhamdhama/zulip,niftynei/zulip,eeshangarg/zulip,samatdav/zulip,brockwhittaker/zulip,brainwane/zulip,AZtheAsian/zulip,dhcrzf/zulip,paxapy/zulip,paxapy/zulip,TigorC/zulip,j831/zulip,zulip/zulip,Jianchun1/zulip,Diptanshu8/zulip,Juanvulcano/zulip,amanharitsh123/zulip,jainayush975/zulip,dattatreya303/zulip,andersk/zulip,zulip/zulip,shubhamdhama/zulip,verma-varsha/zulip,isht3/zulip,rht/zulip,sonali0901/zulip,showell/zulip,grave-w-grave/zulip,calvinleenyc/zulip,brockwhittaker/zulip,Juanvulcano/zulip,arpith/zulip,amanharitsh123/zulip,zacps/zulip,reyha/zulip,blaze225/zulip,sup95/zulip,brockwhittaker/zulip,vabs22/zulip,paxapy/zulip,umkay/zulip,Diptanshu8/zulip,krtkmj/zulip,grave-w-grave/zulip,grave-w-grave/zulip,krtkmj/zulip,dattatreya303/zulip,dawran6/zulip,arpith/zulip,jackrzhang/zulip,brainwane/zulip,niftynei/zulip,vabs22/zulip,timabbott/zulip,isht3/zulip,Diptanshu8/zulip,dattatreya303/zulip,jackrzhang/zulip,ahmadassaf/zulip,zulip/zulip,SmartPeople/zulip,eeshangarg/zulip,calvinleenyc/zulip,mohsenSy/zulip,krtkmj/zulip,umkay/zulip,vikas-parashar/zulip,timabbott/zulip,dawran6/zulip,mohsenSy/zulip,blaze225/zulip,dhcrzf/zulip,cosmicAsymmetry/zulip,rht/zulip,brainwane/zulip,zacps/zulip,mahim97/zulip,jrowan/zulip,Diptanshu8/zulip,timabbott/zulip,peguin40/zulip,sharmaeklavya2/zulip,jackrzhang/zulip,umkay/zulip,souravbadami/zulip,AZtheAsian/zulip,jackrzhang/zulip,rishig/zulip,amanharitsh123/zulip,samatdav/zulip,jainayush975/zulip,paxapy/zulip,umkay/zulip,samatdav/zulip,ahmadassaf/zulip,Galexrt/zulip,calvinleenyc/zulip,Galexrt/zulip,amanharitsh123/zulip,jrowan/zulip,jackrzhang/zulip,tommyip/zulip,amanharitsh123/zulip,sonali0901/zulip,showell/zulip,souravbadami/zulip,PhilSk/zulip,samatdav/zulip,eeshangarg/zulip,SmartPeople/zulip,jrowan/zulip,grave-w-grave/zulip,rht/zulip,mohsenSy/zulip,sonali0901/zulip,ahmadassaf/zulip,verma-varsha/zulip,verma-varsha/zulip,dawran6/zulip,arpith/zulip,tommyip/zulip,PhilSk/zulip,KingxBanana/zulip,eeshangarg/zulip,cosmicAsymmetry/zulip,Jianchun1/zulip,rishig/zulip,j831/zulip,calvinleenyc/zulip,niftynei/zulip,Galexrt/zulip,punchagan/zulip,eeshangarg/zulip,Jianchun1/zulip,blaze225/zulip,punchagan/zulip,synicalsyntax/zulip,peguin40/zulip,rht/zulip,jainayush975/zulip,hackerkid/zulip,kou/zulip,zacps/zulip,Jianchun1/zulip,JPJPJPOPOP/zulip,punchagan/zulip,aakash-cr7/zulip,sonali0901/zulip,arpith/zulip,j831/zulip,ryanbackman/zulip,rishig/zulip,hackerkid/zulip,zulip/zulip,amyliu345/zulip,jrowan/zulip,krtkmj/zulip,vikas-parashar/zulip,punchagan/zulip,Galexrt/zulip,timabbott/zulip,kou/zulip,punchagan/zulip,zulip/zulip,mohsenSy/zulip,eeshangarg/zulip,krtkmj/zulip,vaidap/zulip,jphilipsen05/zulip,rht/zulip,Galexrt/zulip,synicalsyntax/zulip,cosmicAsymmetry/zulip,susansls/zulip,kou/zulip,vaidap/zulip,hackerkid/zulip,mahim97/zulip,souravbadami/zulip,brainwane/zulip,ahmadassaf/zulip,souravbadami/zulip,vabs22/zulip,j831/zulip,shubhamdhama/zulip,peguin40/zulip,tommyip/zulip,timabbott/zulip,synicalsyntax/zulip,synicalsyntax/zulip,punchagan/zulip,sharmaeklavya2/zulip,jainayush975/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,jackrzhang/zulip,zacps/zulip,joyhchen/zulip,blaze225/zulip,samatdav/zulip,Diptanshu8/zulip,Juanvulcano/zulip,jainayush975/zulip,mahim97/zulip,christi3k/zulip,andersk/zulip,niftynei/zulip,eeshangarg/zulip,sharmaeklavya2/zulip,ryanbackman/zulip,samatdav/zulip,sharmaeklavya2/zulip,christi3k/zulip,ryanbackman/zulip