Bulk create need to notify dhcp agent

[Dong Liu]

I bulk created subnets and ports by neutron api.

Using these ports boot instance. I found that the vms could not get ip address.

Then I saw the source code and found that _send_dhcp_notification function only handle ['network', 'subnet', 'port'] resource.

I think we need to handle collections such as ['networks', 'subnets', 'ports'] here.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/55164

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/55164
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bb2c4ef9a26b12c68ca1e6710d0c92ce00c464cb
Submitter: Jenkins
Branch: master

commit bb2c4ef9a26b12c68ca1e6710d0c92ce00c464cb
Author: liudong <email address hidden>
Date: Tue Nov 5 01:14:50 2013 +0800

    After bulk create send DHCP notification

    In the past send_dhcp_notification only handle single resource
    because of VALID_RESOURCES = ['network', 'subnet', 'port'].
    When I use bulk created ports to boot instance, the VMs could
    not get IP address from DHCP agent. So I add some special handle
    in function notify().

    Add unit test for bulk create dhcp notification.

    Modify a paramter for code style.

    Change-Id: Ibf2b3380dc3081beaf0f2f68042b022f2726bbe7
    Closes-Bug: #1247902