pg_backup_and_purge: Don't try to use a virtualenv.
pg_backup_and_purge: Don't try to use a virtualenv.

This makes this actually work if the postgres server is different from
the Zulip app frontend.

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