qemu img cpu limit backport not compatible with liberty oslo version

[John Griffith]

Bug #1449062 was fixed and backported to Liberty by adding qemu limits settings to oslo putils execute call. The problem is that min requirement for Liberty is oslo.concurrency 2.30 and this feature requires oslo.concurrency 2.6.1.

oslo.concurrency isn't pinned but this could cause some issues if folks are on the older version. We should just add a simple try/except block around this so it doesn't break people that are running older versions of oslo.concurrency.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/liberty
Review: https://review.openstack.org/397820

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/397820
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=4295ff0a64f781c3546f6c6e0816dbb8100133cb
Submitter: Jenkins
Branch: stable/liberty

commit 4295ff0a64f781c3546f6c6e0816dbb8100133cb
Author: John Griffith <email address hidden>
Date: Tue Nov 15 09:26:14 2016 -0700

    Check oslo.concurrency supports prlimits

    Bug #1449062 was fixed and backported to Liberty by adding qemu limits settings
    to oslo putils execute call. The problem is that min requirement for Liberty is
    oslo.concurrency 2.30 and this feature requires oslo.concurrency 2.6.1.

    oslo.concurrency isn't pinned but this could cause some issues if folks are on
    the older version. We should just add a simple try/except block around this so
    it doesn't break people that are running older versions of oslo.concurrency.

    Change-Id: I9e3965980f28fc0760b81a6e2d60db33a794cca3
    Closes-Bug: #1641992

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 7.0.3 release.