Amazon Polly Update: Add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: AWS

.changes/next-release/feature-AmazonPolly-30e1499.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Polly",
+    "contributor": "",
+    "description": "Add v2 smoke tests and smithy smokeTests trait for SDK testing."
+}

services/polly/src/main/resources/codegen-resources/service-2.json

@@ -4,10 +4,12 @@
     "apiVersion":"2016-06-10",
     "endpointPrefix":"polly",
     "protocol":"rest-json",
+    "protocols":["rest-json"],
     "serviceFullName":"Amazon Polly",
     "serviceId":"Polly",
     "signatureVersion":"v4",
-    "uid":"polly-2016-06-10"
+    "uid":"polly-2016-06-10",
+    "auth":["aws.auth#sigv4"]
   },
   "operations":{
     "DeleteLexicon":{