get_port(s) iterate once more due to adding binding info

[yong sheng gong]

many plugins still add binding information by iterating once more:
    def get_port(self, context, port_id, fields=None):
        with context.session.begin(subtransactions=True):
            port = super(BrocadePluginV2, self).get_port(
                context, port_id, fields)
            self._extend_port_dict_binding(context, port)

        return self._fields(port, fields)

    def get_ports(self, context, filters=None, fields=None):
        res_ports = []
        with context.session.begin(subtransactions=True):
            ports = super(BrocadePluginV2, self).get_ports(context,
                                                           filters,
                                                           fields)
            for port in ports:
                self._extend_port_dict_binding(context, port)
                res_ports.append(self._fields(port, fields))

        return res_ports

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/34133
Committed: http://github.com/openstack/neutron/commit/76fc0addc985195dc6fddd78c9030cc5d24cfe88
Submitter: Jenkins
Branch: master

commit 76fc0addc985195dc6fddd78c9030cc5d24cfe88
Author: Yong Sheng Gong <email address hidden>
Date: Tue Jul 23 13:21:24 2013 +0800

    refactor port binding codes

    Bug #1195047

    This patch:
    1. removes the iteration in get_ports to call extend_dict_binding
    2. uses a unified way for plugins to do this kind of stuff

    ml2 will enhance the binding so that it can have different binding
    for port according to port's host.
    mlnx and bigswitch are also exceptions due to the dynamic binding info.

    Change-Id: I5a77eb7395e14482a856e033f536f72a1bf82e06