Updated openstack/openstack
Project: openstack/nova  7646c2831540bfc1f9914e7a85f1891e796d3180
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Add API schema for v3 keypairs API

By defining the API schema, it is possible to separate the validation
code from the API method. The API method can be more simple.
In addition, a response of API validation error can be consistent for
the whole Nova API.

Partially implements blueprint nova-api-validation-fw

Change-Id: I484fc2807721b5bfe0f1a11c3811b99a13d920aa