Incorrect error when SSH login fails

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root password on a node was wrong, and mb gave the following error on bootstrap:

[2013-06-13T01:10:39Z] PID[32601] TID[oskzq88ds] INFO: Successfully ran SSH command on: '10.140.48.50' as: 'root' but it failed

Seems like it's not detecting SSH failures properly.

Pulled in from: RiotGamesMinions/motherbrain#566

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fixed in master