change the defaults from a tuple to a list so I can use config.addinivalue_line("python_files", "...") to append new options in my own plugins
change the defaults from a tuple to a list so I can use config.addinivalue_line("python_files", "...") to append new options in my own plugins

--HG--
branch : dgilcrease/change-defaults-from-a-tuple-to-a-list-1412285169250

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