Make tests explicit about cross-realm loophole.
Make tests explicit about cross-realm loophole.

We can currently send a PM to a user in another realm, as long
as we copy a cross-realm bot from the same realm.  This loophole
doesn't yet affect us in practice--all cross-realm bots are
generally configured for the "admin" realm like the old zulip.com--
but we should lock it down in a subsequent commit.

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