fix(config): allow root user to run config command

[acburdine]

closes #981

• this enables the config command to be run as the root user

[coveralls]

Coverage remained the same at 100.0% when pulling 9ee64d3 on acburdine:fix/config-allow-root into 7974124 on TryGhost:master.

[bobhy]

I like the intent of this change, but the default should probably be false to preserve backward compatibility.

[acburdine]

@bobhy it is undefined on all commands by default, which given the way it's used is equivalent to false by default, see https://github.com/TryGhost/Ghost-CLI/blob/master/lib/command.js#L148

[devinowen]

Hey team! Does this change allow you to run ghost start or ghost run as the root user? If so, how should I pass that param?

[vikaspotluri123]

@devinowen this PR only allows the config command to be run as root, it doesn't modify the behavior of start / run

[devinowen]

Thanks @vikaspotluri123!