Amazon Linux platform_version isn't consistent with RHEL

Description

Currently, the Hadoop cookbook treats Amazon Linux exactly like a RHEL-derivative, versioning and all. This means things using the `major_platform_version` variable in the repo recipe will attempt to use something like `2016` when the cookbook is expecting `6` or `7` to be used.

Release Notes

None
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Assignee

Derek Wood

Reporter

Chris Gianelloni