"enable_ipv6" option doesn't affect all IPv6 options

[Ambroise CHRISTEA]

In the settings, you can deactivate IPv6 by adding "'enable_ipv6': False" to OPENSTACK_NEUTRON_NETWORK dictionary.
This disables the IP version input when you create a network, but you still have "IPv6 Address Configuration Mode" option in subnet creation form.
"'enable_ipv6': False" should disable subnet IPv6 option as it does for network IP version choice.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/148946

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/148946
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=05ca6cf1c6b730d75ea131fa6efbc045120066f2
Submitter: Jenkins
Branch: master

commit 05ca6cf1c6b730d75ea131fa6efbc045120066f2
Author: nikunj2512 <email address hidden>
Date: Wed Jan 21 20:08:05 2015 +0530

    Disable the IPv6 components in Subnet form

    In the settings, you can deactivate IPv6 by adding "'enable_ipv6':
    False" to OPENSTACK_NEUTRON_NETWORK dictionary. This disables the
    IP version input when you create a network, but you still have "IPv6
    Address Configuration Mode" option in subnet creation form.
    This patch disables the subnet IPv6 option as it does for network IP
    version choice.

    Change-Id: Ic01ded32c9d21a89da96106badd5545c1099b9ff
    Closes-bug: #1413168