Right now, cli-shell-api always succeeds even when an operation has obviously failed. It does know about failures and prints appropriate messages, but never sets the exit code.
For example, cli-shell-api showConfig not failing for invalid or empty paths makes us explicitly check is a path exists.

In other words... Currnet behaviour:

$ cli-shell-api showConfig foo || echo Fail
Specified configuration path is not valid

Desired behaviour:

$ cli-shell-api showConfig foo || echo Fail
Specified configuration path is not valid
Fail

We likely want to add unique exit codes for different conditions.