IpNetnsCommand will refuse to work without root_helper

[Miguel Angel Ajo]

The network namespace is not mandatory, but that makes
root_wrap non mandatory too, because you could
want to start non-privileged processes outside a
namespace through the same API, covering both
the namespace & non-namespace needs.

[Miguel Angel Ajo (mangelajo)]

https://review.openstack.org/#/c/112798/14/neutron/agent/linux/ip_lib.py (I will extract patch from here)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/114928

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/114928
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=eca9069be3d730c788e433edb291123eede07839
Submitter: Jenkins
Branch: master

commit eca9069be3d730c788e433edb291123eede07839
Author: Miguel Angel Ajo <email address hidden>
Date: Mon Aug 18 12:50:58 2014 +0200

    Fix IpNetnsCommand to execute without root_wrapper when no netns

    IpNetnsCommand accept execution with a network namespace, and
    that requires root privileges and a root_wrapper.
    IpNetnsCommand does accept no namespace too, in that case, the
    root_wrapper doesn't have to be present necessarily, unless the
    command we're executing requires root privileges itself.

    This patch fixes the check condition on IpNetnsCommand execute
    method.

    Change-Id: I5ab2f3f1daf4a5a080611dbcd3dbd43292f6766a
    Closes-Bug: #1358196