configs/configupgrade: Test that map attrs as blocks are fixed

The old parser was forgiving in allowing the use of block syntax where a
map attribute was expected, but the new parser is not (in order to allow
for dynamic map keys, for expressions, etc) and so the upgrade tool must
fix these to use attribute syntax.

configs/configupgrade/test-fixtures/valid/map-attr-as-block/input/map-attr-as-block.tf

@@ -0,0 +1,7 @@
+resource "test_instance" "foo" {
+  type  = "z1.weedy"
+  image = "image-abcd"
+  tags {
+    name = "boop"
+  }
+}

configs/configupgrade/test-fixtures/valid/map-attr-as-block/want/map-attr-as-block.tf

@@ -0,0 +1,7 @@
+resource "test_instance" "foo" {
+  type  = "z1.weedy"
+  image = "image-abcd"
+  tags = {
+    name = "boop"
+  }
+}

configs/configupgrade/test-fixtures/valid/map-attr-as-block/want/versions.tf

@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.12"
+}

configs/configupgrade/test-fixtures/valid/noop/input/resources.tf

@@ -1,3 +1,3 @@
 
-resource "test_resource" "example" {
+resource "test_instance" "example" {
 }

configs/configupgrade/test-fixtures/valid/noop/want/resources.tf

@@ -1,3 +1,3 @@
 
-resource "test_resource" "example" {
+resource "test_instance" "example" {
 }

configs/configupgrade/upgrade_test.go

@@ -188,7 +188,7 @@ var testProviders = map[string]providers.Factory{
 		p := &terraform.MockProvider{}
 		p.GetSchemaReturn = &terraform.ProviderSchema{
 			ResourceTypes: map[string]*configschema.Block{
-				"test_resource": {
+				"test_instance": {
 					Attributes: map[string]*configschema.Attribute{
 						"id":    {Type: cty.String, Computed: true},
 						"type":  {Type: cty.String, Optional: true},