setup.cfg: Test doctests inside modules by default
setup.cfg: Test doctests inside modules by default

--doctest-modules and --doctest-ignore-import-error are used
to test doctests in docstrings in python. The second are skips
files where an import error is got.

Fixes https://github.com/coala-analyzer/coala/issues/1386

incorrectusername/coala,stevemontana1980/coala,damngamerz/coala,rimacone/testing2,Shade5/coala,sils1297/coala,shreyans800755/coala,refeed/coala,tltuan/coala,CruiseDevice/coala,netman92/coala,Asalle/coala,impmihai/coala,aptrishu/coala,impmihai/coala,SanketDG/coala,d6e/coala,sophiavanvalkenburg/coala,Shade5/coala,JohnS-01/coala,MattAllmendinger/coala,RJ722/coala,Asalle/coala,vinc456/coala,MariosPanag/coala,yashLadha/coala,CruiseDevice/coala,kartikeys98/coala,abhiroyg/coala,abhiroyg/coala,MariosPanag/coala,meetmangukiya/coala,JohnS-01/coala,yashtrivedi96/coala,dagdaggo/coala,mr-karan/coala,Balaji2198/coala,djkonro/coala,scottbelden/coala,nemaniarjun/coala,damngamerz/coala,yashLadha/coala,shreyans800755/coala,arjunsinghy96/coala,meetmangukiya/coala,karansingh1559/coala,coala-analyzer/coala,Nosferatul/coala,yashtrivedi96/coala,Nosferatul/coala,incorrectusername/coala,jayvdb/coala,CruiseDevice/coala,ayushin78/coala,Asnelchristian/coala,yashLadha/coala,kartikeys98/coala,NiklasMM/coala,ayushin78/coala,SanketDG/coala,refeed/coala,nemaniarjun/coala,JohnS-01/coala,sagark123/coala,aptrishu/coala,coala-analyzer/coala,aptrishu/coala,arjunsinghy96/coala,coala-analyzer/coala,djkonro/coala,coala/coala,sagark123/coala,tushar-rishav/coala,vinc456/coala,stevemontana1980/coala,NiklasMM/coala,Balaji2198/coala,NalinG/coala,jayvdb/coala,kartikeys98/coala,mr-karan/coala,MattAllmendinger/coala,ManjiriBirajdar/coala,svsn2117/coala,NalinG/coala,Asalle/coala,d6e/coala,scottbelden/coala,d6e/coala,sils1297/coala,NalinG/coala,sagark123/coala,arush0311/coala,NalinG/coala,karansingh1559/coala,NalinG/coala,RJ722/coala,netman92/coala,arjunsinghy96/coala,NiklasMM/coala,abhiroyg/coala,netman92/coala,refeed/coala,impmihai/coala,ManjiriBirajdar/coala,sophiavanvalkenburg/coala,rimacone/testing2,Asnelchristian/coala,SanketDG/coala,jayvdb/coala,coala/coala,rimacone/testing2,coala/coala,stevemontana1980/coala,arush0311/coala,shreyans800755/coala,yashtrivedi96/coala,incorrectusername/coala,karansingh1559/coala,tltuan/coala,ManjiriBirajdar/coala,Shade5/coala,meetmangukiya/coala,scottbelden/coala,dagdaggo/coala,sophiavanvalkenburg/coala,tushar-rishav/coala,Asnelchristian/coala,svsn2117/coala,mr-karan/coala,dagdaggo/coala,NalinG/coala,Nosferatul/coala,svsn2117/coala,vinc456/coala,Balaji2198/coala,arush0311/coala,sils1297/coala,damngamerz/coala,RJ722/coala,NalinG/coala,ayushin78/coala,tltuan/coala,tushar-rishav/coala,nemaniarjun/coala,djkonro/coala,MattAllmendinger/coala,MariosPanag/coala