AWS Batch Update: Add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: AWS

.changes/next-release/feature-AWSBatch-c792359.json

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

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

@@ -10,7 +10,8 @@
     "serviceFullName":"AWS Batch",
     "serviceId":"Batch",
     "signatureVersion":"v4",
-    "uid":"batch-2016-08-10"
+    "uid":"batch-2016-08-10",
+    "auth":["aws.auth#sigv4"]
   },
   "operations":{
     "CancelJob":{