Remove the 'default_ipv4_subnet_pool_label' and 'default_ipv6_subnet_pool_label' configuration options

[Frode Nordahl]

In reference to https://bugs.launchpad.net/bugs/1551333

Mitaka is released and we are now in Newton.

The following changes are required in Horizon:
- Remove the 'default_ipv4_subnet_pool_label' and 'default_ipv6_subnet_pool_label' configuration options.
- Remove relaxation of _check_subnet_data function. It should no longer allow to pass empty 'cidr' and 'subnetpool_id'.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/313533

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/313533
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=2e355837fa04602a36fa7bf338f497636c608f13
Submitter: Jenkins
Branch: master

commit 2e355837fa04602a36fa7bf338f497636c608f13
Author: Frode Nordahl <email address hidden>
Date: Fri May 6 14:36:00 2016 +0200

    Remove deprecated default_*_subnet_pool options

    These options were deprecated in Mitaka and this commit removes
    them from Newton.

    Revert relaxation of _check_subnet_data function. It is no longer
    allowed to pass empty 'subnetpool_id'.

    Change-Id: I86df242a7dda84ef197216aa5c593417038fae3f
    Closes-Bug: #1579035
    Related-Bug: #1551333

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/horizon 10.0.0.0b1 development milestone.