Horizon configuration option to enable Config Drive by default

[Richard Theis]

When launching an instance from Horizon, there is a "Configuration Drive" option under the "Advanced Options" tab. The option is disabled by default. A cloud deployer should be allowed to configure Horizon so that this option is enabled by default.

Background:
The neutron metadata service does not support IPv6 (see https://bugs.launchpad.net/neutron/+bug/1460177). As a result, IPv6 only instances need to use config drive to access their metadata. Because of this, a cloud deployer may want config drive to be enabled by default in cloud environments supporting such instances.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/271464

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/271464
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=73bb9a59435c287c6ab364d92a6defacbbcfa680
Submitter: Jenkins
Branch: master

commit 73bb9a59435c287c6ab364d92a6defacbbcfa680
Author: Justin Pomeroy <email address hidden>
Date: Fri Jan 22 12:28:10 2016 -0600

    Allow setting default value for config_drive

    This adds a setting that can be used to specify the default value
    for the Configuration Drive option when launching an instance.

    Closes-Bug: #1537106
    Change-Id: If402d3331158b462bece27fa6fce2bdb7f6a4a2e

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/horizon 9.0.0.0b3 development milestone.