Comment 51 for bug 1687027

Reviewed: https://review.openstack.org/638117
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8bf3a905e7d05715a913587a9077615a733e5ec1
Submitter: Zuul
Branch: stable/queens

commit 8bf3a905e7d05715a913587a9077615a733e5ec1
Author: Slawek Kaplonski <email address hidden>
Date: Thu Feb 14 11:08:19 2019 +0100

    Add new test decorator skip_if_timeout

    In some cases our db migration tests which run on MySQL are
    failing with timeout and it happens due to slow VMs on which
    job is running.
    Sometimes it may also happen that timeout exception is raised
    in the middle of some sqlalchemy operations and
    sqlalchemy.InterfaceError is raised as last one.
    Details about this exception can be found in [1].

    To avoid many rechecks because of this reason this patch
    introduces new decorator which is very similar to "unstable_test"
    but will skip test only if one of exceptions mentioned above will
    be raised.
    In all other cases it will fail test.

    That should be a bit more safe for us because we will not miss
    some other failures raised in those tests and will avoid rechecks
    because of this "well-known" reason described in related bug.

    [1] http://sqlalche.me/e/rvf5

    Conflicts:
        neutron/tests/functional/db/test_migrations.py

    Change-Id: Ie291fda7d23a696aaa1160d126a3cf72b08c522f
    Related-Bug: #1687027
    (cherry picked from commit c0fec676723649a0516cf3d4af0dccc0fe832095)