lint: Run linters on settings.py files.
lint: Run linters on settings.py files.

This finishes clearing unnecessarily excluded items from the global
tools/lint-all exclude list.  The remaining items are third-party code
or generated code that doesn't make sense to lint.

Fixes #822.

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