Validation in V2 API

[dan wendlandt]

Need to validate input (required fields, etc.) in V2 API code.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/8366
Committed: http://github.com/openstack/quantum/commit/44f66c79d225b651335b2c4c416d1d7ce5751527
Submitter: Jenkins
Branch: master

commit 44f66c79d225b651335b2c4c416d1d7ce5751527
Author: Dan Wendlandt <email address hidden>
Date: Wed Jun 13 10:41:32 2012 -0700

    API v2: mprove validation of post/put, rename few attributes

    bug #1012438

    Additional work for bp v2-api-melange-integration

    - rename few attributes:
      op_state -> status
      additional_routes -> additional_host_routes
      prefix -> cidr

    - expand request body validation to indicate whether fields can be
    specified during create and or update.
    - add test cases to validate defaults, and input validation.

    - update db_base_plugin_v2 to generate gateway_ip for subnet and mac
    for port when unspecified.

    - validate that tenant-id is only specified in req by admin users

    - automatically set tenant-id based on request.context.tenant_id if needed

    - enable port tests in test_db_plugin.py

    Change-Id: If7f5101e4974a6ef93ff8a1d945f8642dd21b16e