Do not send back the response right away when a transaction fails
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                 Key: ODE-680
                 URL: https://issues.apache.org/jira/browse/ODE-680
             Project: ODE
          Issue Type: Improvement
            Reporter: Sean Ahn
            Priority: Minor


ODE engine currently reschedules a job if the job fails in most cases. If a 
database transaction fails due to a deadlock, in many cases the job success on 
the second try. However, we're sending back the response right away after the 
first try.

1. Do not send back the response if the transaction is being rolled back.
2. Send back a failure response on the mex time out. If the mex time out value 
is larger than the client time out, the client will get a time out on the 
response. But, during development, people can get a better response by 
controlling the mex time out value.

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