Removed marking pytest as universal, py26 and py27 are not compatible.
Removed marking pytest as universal, py26 and py27 are not compatible.

--HG--
branch : fix_universal

wfxiang08/pytest,nicoddemus/pytest,skylarjhdownes/pytest,ericdill/pytest,hpk42/pytest,chillbear/pytest,userzimmermann/pytest,jb098/pytest,mbirtwell/pytest,userzimmermann/pytest,ojake/pytest,vodik/pytest,bubenkoff/pytest,bukzor/pytest,hunse/pytest,untitaker/pytest,Akasurde/pytest,Carreau/pytest,MichaelAquilina/pytest,wfxiang08/pytest,jaraco/pytest,chillbear/pytest,JonathonSonesen/pytest,jb098/pytest,tomviner/pytest,tareqalayan/pytest,pelme/pytest,takluyver/pytest,MengJueM/pytest,tgoodlet/pytest,ionelmc/pytest,eli-b/pytest,ghostsquad/pytest,rmfitzpatrick/pytest,flub/pytest,Haibo-Wang-ORG/pytest,bukzor/pytest,gabrielcnr/pytest,doordash/pytest,Haibo-Wang-ORG/pytest,nicoddemus/repo-test,lukas-bednar/pytest,ropez/pytest,alfredodeza/pytest,vodik/pytest,Bachmann1234/pytest,abusalimov/pytest,ericdill/pytest,Bjwebb/pytest,codewarrior0/pytest,vmalloc/dessert,omarkohl/pytest,nicoddemus/pytest,markshao/pytest,pytest-dev/pytest,nicoddemus/repo-test,mdboom/pytest,doordash/pytest,davidszotten/pytest,The-Compiler/pytest,ropez/pytest,codewarrior0/pytest,rouge8/pytest,tomviner/pytest,MengJueM/pytest,chiller/pytest,Carreau/pytest,takluyver/pytest,The-Compiler/pytest,RonnyPfannschmidt/pytest,mdboom/pytest,mhils/pytest,icemac/pytest,Bjwebb/pytest,ghostsquad/pytest,mbirtwell/pytest,ddboline/pytest,malinoff/pytest,hackebrot/pytest,hpk42/pytest,pfctdayelise/pytest,omarkohl/pytest,bubenkoff/pytest,untitaker/pytest,pelme/pytest,hunse/pytest,oleg-alexandrov/pytest,inirudebwoy/pytest,gabrielcnr/pytest,JonathonSonesen/pytest,icemac/pytest,ionelmc/pytest,inirudebwoy/pytest,ojake/pytest,mhils/pytest,txomon/pytest,rouge8/pytest,oleg-alexandrov/pytest,abusalimov/pytest,chiller/pytest,lukas-bednar/pytest,etataurov/pytest,Bachmann1234/pytest