Make `iovncsli` update config consistent

[davepuchyr]

Let's be consistent with the input methodologies for update-fees and update-config. The latter takes each parameter as a command-line option while the form reads from a json file. Let's go with the file method since it's painful to deal with so many command-line parameters and it's easy to create a json file with a query.

Related #235.

[orkunkl]

I will solve this issue in #236