Since we started using experimental Go Modules our editor tooling hasn't
been fully functional, apparently including format-on-save support. This
is a catchup to get everything back straight again.
Since this test sets its own special schema for aws_instance, its expected
output must now be adjusted to only expect values that conform to that
schema. The extraneous attributes like "type" which testDiffFn produces
are no longer visible unless declared in schema.
We also need to now declare "id" as a computed attribute in order for our
state stringer shim to properly populate the formerly-special "ID".
The expected output string for this test is assuming a couple computed
attributes that were not declared in schema. This didn't matter before
because the provider output was not previously subject to schema-based
interpretation, but now our shims to the old provider API rely on the
schema to convert the returned data and so any unexpected attributes are
filtered.
The "config" package is no longer used and will be removed as part
of the 0.12 release cleanup. Since configschema is part of the
"new world" of configuration modelling, it makes more sense for
it to live as a subdirectory of the newer "configs" package.
