provider/aws: Retry ECS svc creation on ClusterNotFoundException

[radeksimko]

This is to address the following intermittent test failure:

=== RUN   TestAccAWSEcsService_withDeploymentValues
--- FAIL: TestAccAWSEcsService_withDeploymentValues (4.09s)
    testing.go:280: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_ecs_service.mongo: 1 error(s) occurred:
        
        * aws_ecs_service.mongo: ClusterNotFoundException: Cluster not found.
            status code: 400, request id: 8968a32f-48eb-11e7-b6ba-119633763b81 "mongodb-8799254687846428972"
FAIL

Here's a snippet from the debug log which proves this is the API call the error is coming from:

2017/06/04 06:03:31 [DEBUG] [aws-sdk-go] DEBUG: Response ecs/CreateService Details:
---[ RESPONSE ]--------------------------------------
HTTP/1.1 400 Bad Request
Connection: close
Content-Length: 68
Content-Type: application/x-amz-json-1.1
Date: Sun, 04 Jun 2017 06:03:31 GMT
Server: Server
X-Amzn-Requestid: 8968a32f-48eb-11e7-b6ba-119633763b81

{"__type":"ClusterNotFoundException","message":"Cluster not found."}
-----------------------------------------------------

[stack72]

More eventual consistency :(

[ghost]

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