etcdv3 acceptance tests fail due to attempting to pass slices of strings
for the endpoints config to HCL2ValueFromConfigValue() which does not
handle that type.
Not a pretty solution but a helper function that converts the endpoints to a slice of
empty interfaces satisfies the requirements of the
HCL2ValueFromConfigValue function.
fixes https://github.com/hashicorp/terraform/issues/28096
faster
The acceptance tests for etcdv3, oss and manta were not validating
required env variablea, chosing to assume that if one was running
acceptance tests they had already configured the credentials.
It was not always clear if this was a bug in the tests or the provider,
so I opted to make the tests fail faster when required attributes were
unset (or "").
The new config loader requires some steps to happen in a different
order, particularly in regard to knowing the schema in order to
decode the configuration.
Here we lean directly on the configschema package, rather than
on helper/schema.Backend as before, because it's generally
sufficient for our needs here and this prepares us for the
helper/schema package later moving out into its own repository
to seed a "plugin SDK".
Jason Smith