Remove stale AWS configuration from Omnibus

Stan Hurequested to merge
sh-remove-stale-aws-config into master

This is stale and no longer used. Object storage is now configured in each specific gitlab.yml section (e.g. uploads, lfs, etc.).

Relates to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20273

Closes #3641 (closed)

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