nomad-acl-token being logged by by default

[awheeler]

The nomad-acl-token is being logged at the default logging level of info. I think that it makes sense to log other useful info at info level, but secret info like tokens would ideally never be logged, or at best, at debug level only.
In looking at the code, it seems most if not all logging is done at the info level, so other levels of logging aren't very useful as a work-around.

That said, I really like this tool, thank you!