Add 'collect' attribute to senlin cluster resource

[Ethan Lynn]

Senlin cluster-collect interface is helpful to collect attributes of nodes from a cluster, it would be helpful to expose it as a attribute of cluster, so that it's easy to integrate senlin with other projects in a heat template.

[Ethan Lynn (ethanlynn)]

https://review.openstack.org/#/c/423992/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/423992
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=e87322807d5bb1dfa452de7a59f482782adca9a4
Submitter: Jenkins
Branch: master

commit e87322807d5bb1dfa452de7a59f482782adca9a4
Author: Ethan Lynn <email address hidden>
Date: Mon Jan 23 16:26:49 2017 +0800

    Add attribute 'collect' to senlin cluster

    Add attribute 'collect' to senlin cluster, this attribute
    will call senlin cluster-collect to collect specify
    attributes of nodes in a cluster.
    Following snippet will show you how to get IPs of nodes in a cluster.
    {get_attr: [cluster, collect, details.addresses.private[0].addr]}

    Closes-Bug: #1659204
    Change-Id: I0c5d8bef4b86d1e12dd9440d28c5d137ee17992f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/heat 8.0.0.0b3 development milestone.