Vendoring and secondary disk configuration option

[pepov]

My original intent was only to add an option to be able to use a secondary disk, however I was unable to build the projekt due to type inconsistencies caused by packer vendoring. So I followed the packer way of vendoring using Godep and replaced the ssh package as well to be able to build the binary.

The secondary disk config addition is a bit dumb, please advise me if you would like to see this a bit more sophisticated.

Sorry for the gofmt noise in the diffs, I hope it is still readable.

[cmluciano]

Fixed here https://github.com/watson-platform/packer-builder-softlayer, can you rebase and pull against that repo?

[pepov]

yes, thanks