can't update ipv6-ra-mode and ipv6-address-mode due to invalid ip version exception

[Baodong (Robert) Li]

$ neutron subnet-update --ipv6-ra-mode dhcpv6-stateful ipv6-private-subnet
'Namespace' object has no attribute 'ip_version'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/123744

[Armando Migliaccio (armando-migliaccio)]

Hang on, what's the state of the subnet prior to the update?

[OpenStack Infra (hudson-openstack)]

Change abandoned by Baodong (Robert) Li (<email address hidden>) on branch: master
Review: https://review.openstack.org/123756
Reason: similar bug 1363064 opened and review submitted earlier than this one.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/123744
Committed: https://git.openstack.org/cgit/openstack/python-neutronclient/commit/?id=81fe0c776cf1a3b7c8b3a4d9b3224743439b295e
Submitter: Jenkins
Branch: master

commit 81fe0c776cf1a3b7c8b3a4d9b3224743439b295e
Author: Robert Li <email address hidden>
Date: Wed Sep 24 10:13:44 2014 -0400

    Don't allow update of ipv6-ra-mode and ipv6-address-mode

    These two parameters are not updatable from the nuetron server.
    And therefore for subnet-update command, they should not be displayed
    in the help message.

    Change-Id: I3a6abc3a4e3030d73715d55c340a77b44d41f140
    Closes-Bug: #1373417