setup_venv: Fix handling of Git requirements.
setup_venv: Fix handling of Git requirements.

get_package_names did not correctly strip the GitHub URLs from package
names, resulting in the "package names" for our dependencies installed
from Git being tracked with the complete sha1sum included in the name.
This meant that upgrading our virtualenvs incorrectly ended up
resorting to creating an entirely new virtualenv whenever we changed a
dependency that had previously been installed from GitHub URLs.

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