ACL: refactor+fix AUTH check in processCommand().
ACL: refactor+fix AUTH check in processCommand().

The part that is fixed is that now if the default user is off whatever
is its configuration the user is not considered authenticated.

charsyam/redis,antirez/redis,ofirluzon/redis,antirez/redis,oranagra/redis,ofirluzon/redis,pmem/redis,yossigo/redis,pmem/redis,PKRoma/redis,oranagra/redis,ofirluzon/redis,charsyam/redis,soloestoy/redis,soloestoy/redis,yossigo/redis,soloestoy/redis,charsyam/redis,soveran/redis,soveran/redis,ctripcorp/redis,oranagra/redis,ctripcorp/redis,yossigo/redis,pmem/redis,soveran/redis,soloestoy/redis,ofirluzon/redis,antirez/redis,oranagra/redis,ctripcorp/redis,neomantra/redis,yossigo/redis,pmem/redis,yossigo/redis,charsyam/redis,soveran/redis,oranagra/redis,PKRoma/redis,neomantra/redis,neomantra/redis,charsyam/redis,ctripcorp/redis,PKRoma/redis,antirez/redis,ofirluzon/redis,neomantra/redis,soloestoy/redis,PKRoma/redis,neomantra/redis,PKRoma/redis