Add eks example test

[corymhall]

Adds an example test for using the aws eks Terraform module

re #211

[corymhall]

This change is part of the following stack:

• Restore terraform error logging #222
  • Log the human readable plan to debug log #227
    • Add eks example test #229 ◀

_{Change managed by git-spice.}

[t0yv0]

Thanks @flostadler also for consulting!