missing json-schema for fixed-ips

[Alex Xu]

The action reserve/unreserve didn't accept any input from the request body. So we can use json-schema to limit it.

And the api sample files is wrong:

 {
    "reserve": "None"
 }

It should accept a null, not a string "None"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/169139

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/169139
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8423a9cd1539d1f7621f6b703c8782ce09846868
Submitter: Jenkins
Branch: master

commit 8423a9cd1539d1f7621f6b703c8782ce09846868
Author: He Jie Xu <email address hidden>
Date: Wed Apr 1 00:47:14 2015 +0000

    Add json-schema for v2.1 fixed-ips

    This patch adds json-schema for v2.1 fixed-ips. The json-schame limits
    the input for actions reserve/unreserve. Also fixed the API sample
    file at same time and add parameter_type none.

    Co-Authored-By: Ken'ichi Ohmichi <email address hidden>
    Change-Id: Id2d0416c3ccc2a50d3cb66bed8747082f98fb194
    Closes-Bug: #1438480