Description of problem:
Hi, I just recently use `beak` to test our system. I think the client configure files behaviour may not work as my expect.
Beaker file have two files: "~/.beak_client/config" and "/etc/beaker/config".Client only use one of them to apply.I think it seems strange.Can Beaker behaviour like `git config`.
`/etc/beaker/config` is a global default config for all users, and "~/.beak_client/config" is user config.User config can override global config when client start.

If you want to change to this mode, I can do a pull request in Github to modify this.