Potential deadlock if job manager is restarted
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                 Key: SLING-1982
                 URL: https://issues.apache.org/jira/browse/SLING-1982
             Project: Sling
          Issue Type: Bug
          Components: Extensions
    Affects Versions: Extensions Event 3.0.2, Extensions Event 3.0.0
            Reporter: Carsten Ziegeler
            Assignee: Carsten Ziegeler
             Fix For: Extensions Event 3.0.4


If the manager is restarted it restarts all jobs - if at the same time a 
cleanup is started this can lead to a deadlock as both tasks need a lock to the 
queueLock and the backgroundSession (in reverse order)

The manager can either be restarted through the interface or due to a 
reconfiguration.

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