Wrong variable names " addFixedIp" and "networkId" in multinic-add-fixed-ip-req.json

[Shuangtai Tian]

{
   "addFixedIp":{
   "networkId": 1
}
}

the variable names should be "add_fixed_ip" and "network_id"
those are forgot to change in the abaadf09ed86ef68(Adds V3 API samples for cells and multinic)

please see：
https://github.com/openstack/nova/blob/master/nova/tests/integrated/v3/api_samples/os-multinic/multinic-add-fixed-ip-req.json.tpl#L2

https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/plugins/v3/multinic.py#L54

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/64787

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/64787
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1b0d1bebaeb0e4a748289438141e195852fd2b33
Submitter: Jenkins
Branch: master

commit 1b0d1bebaeb0e4a748289438141e195852fd2b33
Author: Shuangtai Tian <email address hidden>
Date: Fri Jan 3 14:08:11 2014 +0800

    Fix a bug in v3 API doc

    This patch changes the wrong variable names 'addFixedIp' and 'networkId',
    which were not used in V3 multinic API. We use 'add_fixed_ip' and
    'network_id' in V3 multinic API.

    Closes-bug: #1265716

    Change-Id: I0c91764603d941df6d011a3b1266eb354c0bc54f