Can't disassociate gateway ip for subnet

[huangtianhua]

1. create a stack with neutron subnet
***********************
heat_template_version: 2014-10-16
resources:
  subnet:
    type: OS::Neutron::Subnet
    properties:
      network: 3447dd80-14ef-4059-8ea6-35f4fd60ba26
      cidr: 20.0.1.0/29
      gateway_ip: 20.0.1.5

2. want to disassociate the gateway ip(20.0.1.5), so to update the stack with template:
****************************
heat_template_version: 2014-10-16
resources:
  subnet:
    type: OS::Neutron::Subnet
    properties:
      network: 3447dd80-14ef-4059-8ea6-35f4fd60ba26
      cidr: 20.0.1.0/29

3. the stack went to UPDATE_COMPLETE, but we can find that the subnet also has the gateway ip(20.0.1.5)

4. Also, we can't set 'gateway_ip: null' in template, an error raised: BadRequest: Invalid input for gateway_ip. Reason: '' is not a valid IP address.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/250136

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/250136
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=794a39cf670920ef58137f471e5f516a2227ac67
Submitter: Jenkins
Branch: master

commit 794a39cf670920ef58137f471e5f516a2227ac67
Author: huangtianhua <email address hidden>
Date: Sat Oct 31 11:26:55 2015 +0800

    Improve gateway_ip updation for subnet

    Allow update 'gateway_ip' to null or empty for
    neutron subnet, and keep the same behavior as
    creation.
    Also, this change adds some related functional
    tests for neutron subnet resource.

    Closes-Bug: #1510800
    Change-Id: Ib5511402e1d118457356a8add0042be2b157eb24

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/heat 6.0.0.0b2 development milestone.

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/heat 6.0.0.0b2 development milestone.