…e-state-data-source

Adding missing S3 force_path_style option to schema check.

The changes to `version_set_test.go` are backported from v0.12.

This PR improves the error handling so we can provide better feedback about any service discovery errors that occured.

Additionally it adds logic to test for specific versions when discovering a service using `service.vN`. This will enable more informational errors which can indicate any version incompatibilities.