configs/configupgrade: Pass through connection and provisioner blocks

This is a temporary implementation of these rules just so that these can
be passed through verbatim (rather than generating an error) while we
do testing of other features.

A subsequent commit will finish these with their own custom rulesets.

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

@@ -1,3 +1,11 @@
 
 resource "test_instance" "example" {
+  connection {
+    host = "127.0.0.1"
+  }
+  provisioner "local-exec" {
+    connection {
+      host = "127.0.0.2"
+    }
+  }
 }

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

@@ -1,3 +1,11 @@
 
 resource "test_instance" "example" {
+  connection {
+    host = "127.0.0.1"
+  }
+  provisioner "local-exec" {
+    connection {
+      host = "127.0.0.2"
+    }
+  }
 }

configs/configupgrade/upgrade_native.go

@@ -329,6 +329,24 @@ func (u *Upgrader) upgradeNativeSyntaxResource(filename string, buf *bytes.Buffe
 	rules["depends_on"] = dependsOnAttributeRule(filename, an)
 	rules["provider"] = maybeBareTraversalAttributeRule(filename, an)
 	rules["lifecycle"] = nestedBlockRule(filename, lifecycleBlockBodyRules(filename, an), an, adhocComments)
+	rules["connection"] = func(buf *bytes.Buffer, blockAddr string, item *hcl1ast.ObjectItem) tfdiags.Diagnostics {
+		// TODO: For the few resource types that were setting ConnInfo in
+		// state after create/update in prior versions, generate the additional
+		// explicit connection settings that are now required if and only if
+		// there's at least one provisioner block.
+		// For now, we just pass this through as-is.
+		hcl1printer.Fprint(buf, item)
+		buf.WriteByte('\n')
+		return nil
+	}
+	rules["provisioner"] = func(buf *bytes.Buffer, blockAddr string, item *hcl1ast.ObjectItem) tfdiags.Diagnostics {
+		// TODO: Look up the provisioner schema and map this properly to ensure
+		// any references get properly updated.
+		// For now, we just pass this through as-is.
+		hcl1printer.Fprint(buf, item)
+		buf.WriteByte('\n')
+		return nil
+	}
 
 	printComments(buf, item.LeadComment)
 	printBlockOpen(buf, blockType, labels, item.LineComment)