Fail fast in checking SQS queue length when we use wrong aws account.

1. If we use an invalid aws account, it'll throw RightAws::AwsError.
2. If we use a valid aws account but no queue is found, it'll abort with
an error message.

Change-Id: Ief464a30af67720dfa8d219bbe500f49dc70cb3b
Merge "Fail fast in checking SQS queue length when we use wrong aws account." into red_black