fix AWS::S3 namespacing issue
fix AWS::S3 namespacing issue

we added a Canvas::AWS module, so if that gets loaded first, this
instance got confused

fixes CNVS-33806

test plan:
- Load the new module: `Canvas::AWS.validate_v2_config`
- Load the cdn uploader: `Canvas::Cdn::S3Uploader.new`
- it should work

Change-Id: I71bb61c0ca2f1c9784a8bf5c458455ab60dddd20
Reviewed-on: https://gerrit.instructure.com/97322
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Jenkins
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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