Remove deprecated namespace deletion options

[Cedric Brandily]

dhcp/router_delete_namespaces[1] options have been defined as a workaround to an iproute2 limitation[1] corrected 2 years ago.

That's why it's to remove them after their deprecation in Liberty[2].

[1] https://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=58a3e8270fe72f8ed92687d3a3132c2a708582dd
[2] https://bugs.launchpad.net/neutron/+bug/1418079

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/237779

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/237779
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bd0e8af34ceb247273eb666681051228e458b954
Submitter: Jenkins
Branch: master

commit bd0e8af34ceb247273eb666681051228e458b954
Author: Cedric Brandily <email address hidden>
Date: Tue Oct 20 23:03:39 2015 +0200

    Remove deprecated namespace deletion options

    dhcp/router_delete_namespaces[1] options have been defined as a
    workaround to an iproute2 limitation[1] corrected 2 years ago.

    That's why the change removes these options after their deprecation
    in Liberty.

    [1] in neutron.agent.dhcp/l3.config

    DocImpact
    Closes-Bug: #1508189
    Related-Bug: #1418079
    Change-Id: I2a879213c3b095a007a4531f430a33cea9fdf1bd

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/neutron 8.0.0.0b1 development milestone.