id() builtin used instead of subnet id in error messages

[Salvatore Orlando]

This occurs twice in _validate_subnet:
https://github.com/openstack/neutron/blob/master/neutron/db/db_base_plugin_v2.py#L1049
https://github.com/openstack/neutron/blob/master/neutron/db/db_base_plugin_v2.py#L1063

[ZhiQiang Fan (aji-zqfan)]

Actually, _validate_subnet is called in create_subnet() and update_subnet(), and the param s[ubnet] is user's input, which will not ontain an id

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/42679

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/42679
Committed: http://github.com/openstack/neutron/commit/6b0c899d36d5a98963342e9cffb351fc3a1f4fd2
Submitter: Jenkins
Branch: master

commit 6b0c899d36d5a98963342e9cffb351fc3a1f4fd2
Author: ZhiQiang Fan <email address hidden>
Date: Tue Aug 20 00:05:15 2013 +0800

    Use subnet id instead of wrong built-in id()

    In _validate_subnet(), built-in id() is used as param for exceptions,
    this patch fixes it via using proper subnet id.

    Closes-Bug: #1213930

    Change-Id: I9a88f4dc7b771047f4061fb94ba65f0515afa745