Comment 71 for bug 1596075

Reviewed: https://review.openstack.org/344013
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=c46edbc7d62585b0181dfe4bb72c1be0620fc937
Submitter: Jenkins
Branch: master

commit c46edbc7d62585b0181dfe4bb72c1be0620fc937
Author: Kevin Benton <email address hidden>
Date: Mon Jul 18 22:39:19 2016 -0600

    Use db_api.retry_db_errors in quota engine

    The quota engine was still using oslo_db wrap_db_retry
    which does not automatically take into account deadlocks
    that occur inside of nested savepoint transactions.

    In one case it didn't matter because it passed in the correct
    exception checker but in the one that protected 'set_quota_usage'
    it did not use is_retriable so a deadlock inside of the savepoint
    would have resulted in a much more expensive retry all of the way
    up at the API layer.

    This patch just adjusts them to both use the standard neutron
    retry_db_errors decorator.

    Change-Id: I1e45eb15f14bf35881e5b1dce77733e831e9c6b1
    Related-Bug: #1596075