The floating ip should be removed after shelve offload instance

[Alex Xu]

Commit: 4f8185549dfe11eb1ce405711593baa1528045ea fixes the problem of update binding when unshelve instance for neutron. But that fixing didn't cover the case for nova-network. For nova-network with multi host, the floating ip should be removed when shelve offload instance.

produce as below:
1. nova boot vm1
2. iptables -t nat -L -n check the floating ip rules for vm1
3. nova shelve vm1
4. waiting for vm1 shelve offload
6. running iptables again, found the floating ip rules still existed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/110869

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/110869
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=0ed0873240727c2e447613d23ebe1d9e53c79e44
Submitter: Jenkins
Branch: master

commit 0ed0873240727c2e447613d23ebe1d9e53c79e44
Author: He Jie Xu <email address hidden>
Date: Mon Aug 25 17:37:09 2014 +0800

    Update network resource when shelve offload instance

    Commit: 4f8185549dfe11eb1ce405711593baa1528045ea fixes the problem
    by invoke migrate_instance_finish function. But that function should
    be used by only for migration case. This patch use the new network api
    'setup_instance_network_on_host' to update network for instance.

    Also for nova-network, floating-ip should cleanup when unshelve offload
    instance. This patch invoke cleanup_instance_network_on_host when unshelve
    offload instance.

    Change-Id: I75df695ec7b14ebaa25f384ba9a0697a179af03a
    Closes-Bug: #1350704