Allow Amazon-Import to only import to S3

[gcblack]

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Description

Requesting to be able to have 'Amazon Import' post-processor to upload a created image to S3, skipping the AMI conversion step.
Many people are starting to use S3 as a 'static' content library for vSphere. Being able to have packer create images and dump them directly to an S3 bucket would be great.

Use Case(s)

Any customer that often builds and destroys vSphere environments are starting to use S3 as a static content library for vCenter.

Potential configuration

Potential References