Comment 14 for bug 1422504

Reviewed: https://review.openstack.org/231985
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=f0bb982bfc81bb7c5bafde1430c51bea8f8ab9c9
Submitter: Jenkins
Branch: stable/juno

commit f0bb982bfc81bb7c5bafde1430c51bea8f8ab9c9
Author: Oleg Bondarev <email address hidden>
Date: Wed May 6 12:50:11 2015 +0300

    Wrap ML2 delete_port with db retry decorator

    ML2 delete_port operation currently involves locking ports
    and bindings tables which may lead to DBDeadlock errors in certain
    cases when several ports are deleted concurrently.
    That may happen due to specifics of Galera working in active-active
    mode: it may throw deadlock errors when it fails to validate
    a change with other members of the cluster.
    The fix adds retries to delete port operation to overcome such
    deadlocks

    Conflicts:
        neutron/plugins/ml2/plugin.py
        neutron/tests/unit/ml2/test_ml2_plugin.py

    Closes-Bug: #1422504
    Change-Id: I684691d59c5ac370d74314c3c91857dc709b2d9b
    (cherry picked from commit 45ea2cf10033e12c63b8ce2cd78b04755d0aba64)
    (cherry picked from commit 151b28cf1ce697f481d65b8d5bee1e3a4becbbc5)