Revert "Add os_image_s3_version to build and publish cmd"

This reverts commit 0e69492dc22b031a1656ded8092fc7c6ada30408.
Revert "Add os_image_s3_version to publish_stemcell_in_vm"

This reverts commit 2b493770b97e917144307f14cc7dff3e094a85a1.
Revert "Add and require os_image_version for stemcell:build"

This reverts commit 02d7e67cd7de4aa07ecd8c374a84cbda982c29db.
Lock down os_image_version in code

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Update OS_IMAGES.md

Signed-off-by: Kris Hicks <krishicks@gmail.com>