test_messages: Fix trying to login as a bot user.
test_messages: Fix trying to login as a bot user.

Due to a recent refactoring, the first user in the subscribers list is
now a bot.

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