VCS/PostgreSQL prevent dead lock during read acl update
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                 Key: NXP-4845
                 URL: https://jira.nuxeo.org/browse/NXP-4845
             Project: Nuxeo Enterprise Platform
          Issue Type: Improvement
    Affects Versions: 5.3 GA
            Reporter: Benoit Delbosc


SQL "TRUNCATE" command requires an exclusive lock that can lead to db dead 
lock, NXP-4557:removes most of the truncate usage during read acl update, .
There is still one possible truncate during acl update to flush a cache, this 
must be done at the end of the transaction to prevent holding the lock too long.

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