core: provider alias inheritance

An aliased provider should not be automatically inherited, nor
implicitly instantiated in a module. This test should not have
previously passed.

Add a proxy provider block to the module and update the provider to
match the schema.

terraform/context_apply_test.go

@@ -2536,7 +2536,7 @@ func TestContext2Apply_moduleInheritAlias(t *testing.T) {
 	p.DiffFn = testDiffFn
 
 	p.ConfigureFn = func(c *ResourceConfig) error {
-		if _, ok := c.Get("child"); !ok {
+		if _, ok := c.Get("value"); !ok {
 			return nil
 		}
 

terraform/test-fixtures/apply-module-provider-inherit-alias/child/main.tf

@@ -1,3 +1,7 @@
+provider "aws" {
+  alias = "eu"
+}
+
 resource "aws_instance" "foo" {
     provider = "aws.eu"
 }

terraform/test-fixtures/apply-module-provider-inherit-alias/main.tf

@@ -3,7 +3,7 @@ provider "aws" {
 }
 
 provider "aws" {
-    child = "eu"
+    value = "eu"
     alias = "eu"
 }