Terraform test.pypi.org and associated fastly services

[ewdurbin]

Currently the following domains are served from Fastly services which are unmanaged by terraform:

Warehouse (Staging)

• test-files.pythonhosted.org (Equivalent to "PyPI File Hosting" service)
• test.pythonhosted.org (Equivalent to "PyPI Docs Hosting" service)
• test.pypi.org (Equivalent to "PyPI service")
• test.pypi.io (Equivalent to "PyPI service")
• warehouse-staging.python.org (Equivalent to "PyPI service")

TestPyPI (Legacy)

• testpypi.python.org (Equivalent to "PyPI service")

Goal is to move all of this to three services that match the production setup (warehouse, files, docs), then abstract any necessary differences to configuration, then build both the test and prod environments from the same Terraform module.

[ewdurbin]

Successfully migrated test-files.pythonhosted.org to terraform management with #96

[cegerhardson]

Successfully migrated test.pythonhosted.org to terraform with #98

[cegerhardson]

Successfully migrated test.pypi.org to terraform with #99

[ewdurbin]

Thanks for your work on this @cegerhardson!