Find chef-zero executable location

This might have changed in 11.
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Merge pull request #9 from odcinek/zero_location

Find chef-zero executable location
TT: version bump
Fix ssh options

We had multiple problems with this and seen ExitOnForwardFailure misbehaving,
let's give this parameter combination a shot.
Merge pull request #10 from odcinek/ssh_options

Fix ssh options