Comment 5 for bug 1622010

Reviewed: https://review.openstack.org/374245
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=8d12ba37367a55ccdf3c73cc74783951c3adcb68
Submitter: Jenkins
Branch: stable/mitaka

commit 8d12ba37367a55ccdf3c73cc74783951c3adcb68
Author: Lance Bragstad <email address hidden>
Date: Fri Sep 9 22:10:02 2016 +0000

    Consistently round down timestamps

    This is one of the ways we can prevent race conditions with backends that round
    datetime objects or strings before persisting them.

    Closes-Bug: 1622010
    (cherry picked from commit 301b6a7bc770830485937f0b9927a26e2e5ec8c8)

    Conflicts:
     keystone/tests/unit/test_v3_auth.py: freezegun was added only in Newton
     keystone/tests/unit/test_v3_os_revoke.py: minor conflict

    In addition to cherry-pick, time.sleep() was added to several tests.
    The tests assume that some time must pass between some operations.
    In Newton and later this was done in other, unrelated commits and
    freezegun was used. Freezegun cannot be used in Mitaka. Because of
    that, time.sleep() was added at the same places where freezegun's
    tick() is used in Newton.

    Change-Id: I7c6d525dfb4ec13edb360a77b27422310d545305