Remove unneeded alias name for DisabledConfigFormatter

The alias names of builtin formatters are just for users.
We can specify the class directly because DisabledConfigFormatter is not
exposed to users.
Refactor exception handling in CLI#run
Display default progress format in console in --auto-gen-config mode
Merge pull request #402 from yujinakayama/supplement-to-auto-gen-config

Supplements to --auto-gen-config mode