DefaultArgParser.py: Add Default log level to help
DefaultArgParser.py: Add Default log level to help

This adds default log level - INFO to `-L help`.

Closes https://github.com/coala/coala/issues/3618

incorrectusername/coala,shreyans800755/coala,CruiseDevice/coala,coala/coala,refeed/coala,Nosferatul/coala,arush0311/coala,rimacone/testing2,Balaji2198/coala,impmihai/coala,Shade5/coala,meetmangukiya/coala,sagark123/coala,shreyans800755/coala,kartikeys98/coala,Asnelchristian/coala,meetmangukiya/coala,NiklasMM/coala,incorrectusername/coala,Nosferatul/coala,JohnS-01/coala,NiklasMM/coala,SanketDG/coala,jayvdb/coala,rimacone/testing2,Balaji2198/coala,kartikeys98/coala,netman92/coala,arush0311/coala,coala/coala,coala/coala,kartikeys98/coala,ayushin78/coala,MariosPanag/coala,Asalle/coala,ayushin78/coala,impmihai/coala,yashLadha/coala,coala-analyzer/coala,Asnelchristian/coala,refeed/coala,karansingh1559/coala,RJ722/coala,karansingh1559/coala,jayvdb/coala,damngamerz/coala,incorrectusername/coala,JohnS-01/coala,Asalle/coala,arjunsinghy96/coala,sagark123/coala,CruiseDevice/coala,yashtrivedi96/coala,damngamerz/coala,Asalle/coala,damngamerz/coala,RJ722/coala,Balaji2198/coala,ayushin78/coala,coala-analyzer/coala,netman92/coala,karansingh1559/coala,meetmangukiya/coala,Shade5/coala,CruiseDevice/coala,yashLadha/coala,arjunsinghy96/coala,aptrishu/coala,refeed/coala,nemaniarjun/coala,yashtrivedi96/coala,aptrishu/coala,Nosferatul/coala,MariosPanag/coala,NiklasMM/coala,SanketDG/coala,impmihai/coala,sagark123/coala,jayvdb/coala,JohnS-01/coala,RJ722/coala,nemaniarjun/coala,arush0311/coala,arjunsinghy96/coala,yashLadha/coala,MariosPanag/coala,SanketDG/coala,yashtrivedi96/coala,nemaniarjun/coala,coala-analyzer/coala,netman92/coala,rimacone/testing2,Asnelchristian/coala,aptrishu/coala,shreyans800755/coala,Shade5/coala