Get 7zip path from the windows registry.

[buri17]

The current implementation assumes that the 7-zip is installed under %SYSTEMDRIVE%\7-zip.

However, the latest sevenzip cookbook doesn't install 7-zip the above location.

This patch changes the logic to determine the 7-zip path same as the sevenzip cookbook.
See https://github.com/daptiv/seven_zip/blob/master/providers/archive.rb.

[chef-supermarket]

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• @buri17

Please sign the CLA here.

[chef-supermarket]

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[tas50]

@buri17 You have some failures in the specs