Support overriding default origin ID

[mchristopher]

what

• Add support for default_origin_id variable, to support custom origin groups on the default behavior.
• Add optional group_id variable to origin_groups to avoid race conditions when specifying origin groups in behaviors.

why

• There was no way to activate support for multi-region S3 buckets since origin groups have generated IDs, and you cannot access the id attributes outside of the module code.

references

[hans-d]

/terratest

[mergify]

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[Gowiem]

/terratest

[Gowiem]

Hey @mchristopher, unfortunately, we need to run some automation to pass our tests. Mind doing the following locally, adding + committing the result, and pushing to your branch?

make init
make readme

Thanks!

[Gowiem]

And actually it seems there is some lint errors in this repo overall, would you mind addressing those to move this PR forward?