feat(client-efs): Add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: awstools

Diff for: codegen/sdk-codegen/aws-models/efs.json

@@ -1405,7 +1405,20 @@
           "outputToken": "NextMarker",
           "items": "FileSystems",
           "pageSize": "MaxItems"
-        }
+        },
+        "smithy.test#smokeTests": [
+          {
+            "id": "DescribeFileSystemsSuccess",
+            "params": {},
+            "vendorParams": {
+              "region": "us-west-2"
+            },
+            "vendorParamsShape": "aws.test#AwsVendorParams",
+            "expect": {
+              "success": {}
+            }
+          }
+        ]
       }
     },
     "com.amazonaws.efs#DescribeFileSystemsRequest": {
@@ -2772,7 +2785,7 @@
           "sdkId": "EFS",
           "arnNamespace": "elasticfilesystem",
           "cloudFormationName": "EFS",
-          "cloudTrailEventSource": "efs.amazonaws.com",
+          "cloudTrailEventSource": "elasticfilesystem.amazonaws.com",
           "docId": "elasticfilesystem-2015-02-01",
           "endpointPrefix": "elasticfilesystem"
         },