Added VPC endpoints from #311 to Terraform 0.11 branch (#319)

* add missing endpoints from #311

* fix mistakes in endpoint names

* added endpoints cloudformation, codepipeline, appmesh, sagemaker (api+runtime), transfer, servicecatalog, storagegateway

* fix mistakes in endpoint names

* fix mistakes in endpoint names

* add endpoint tag to full example

* terraform format

Author: DrFaust92

README.md

@@ -97,4 +97,8 @@ module "vpc" {
     Environment = "staging"
     Name        = "complete"
   }
+
+  vpc_endpoint_tags = {
+    Endpoint = true
+  }
 }