Fixing ssh_key issues with pull request 762
Fixing ssh_key issues with pull request 762

ssh_key_to_a should be calling definition.ssh_key since the variable ssh_key"
is not defined until lower in the loop. Also, in the loop we should be refering
to the variable from the array created by ssh_key_to_a when figuring out
a path.

I also noticed that if no ssh command was given, a nasty shellescape error was
given, so we should raise an error if that is the case.

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