Updated openstack/openstack
Project: openstack/nova  7ac967d06bd1c2eff1e1f4bc60a71bfd0a0adb1b

Add API schema for v2.1/v3 attach_interfaces 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 v3-api-schema

Change-Id: I0c4066c34f6da0934946aa9eda907b911dbede16