mogan cannot show floatingip if a floatingip associated

[Liusheng]

Now, floatingip won't be saved to Mogan's db if a floatingip associated. and won't check if associate duplicated.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/475622

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/475625

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/475622
Committed: https://git.openstack.org/cgit/openstack/mogan/commit/?id=ff7211c35fe63ac4e72756b3e480ac7b430785f0
Submitter: Jenkins
Branch: master

commit ff7211c35fe63ac4e72756b3e480ac7b430785f0
Author: liusheng <email address hidden>
Date: Tue Jun 20 10:23:04 2017 +0800

    Make floatingip can be saved to db and can be displayed

    For now, we don't implementation the functionality of saving and
    displaying floatingip to end users. This patch add that and improve the
    check of association and disassociation floating ips.

    Change-Id: I2b19dabb89b9915f5e3aec875bff3ef6c011c73a
    Closes-Bug: #1698995

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/475625
Committed: https://git.openstack.org/cgit/openstack/python-moganclient/commit/?id=97c6915160a2f186e0e29691cd8812494e726787
Submitter: Jenkins
Branch: master

commit 97c6915160a2f186e0e29691cd8812494e726787
Author: liusheng <email address hidden>
Date: Tue Jun 20 10:53:58 2017 +0800

    Make the floating ip can be show in netinfo command

    Because a wrong field extraction, the floating ip cannot be correctly
    extracted from the api response, this change fix it.

    Change-Id: I62bd53f1e187d4217786071d114954a89a2beb76
    Closes-Bug: #1698995