OOZIE-6: Oozie should reject coordinators with zero instances
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                 Key: OOZIE-423
                 URL: https://issues.apache.org/jira/browse/OOZIE-423
             Project: Oozie
          Issue Type: Improvement
            Reporter: Hadoop QA
            Assignee: Roman Shaposhnik
            Priority: Minor


When a user submits a coordinator with an end-time that is less or equal to its 
start time, then this coordinator will never be executed. That is correct 
behavior according to coordinator semantics (because the end time is not 
included in the life time of the coordinator). But it is very unlikely that a 
user would actually want to submit such a job - it is probably a typo or 
copy/paste error. Thus, Oozie should reject such coordinators as invalid, 
instead of silently ignoring them.

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