Add unbind interface api

Registered by Eli Qiao on 2014-10-31

Currently, we have attach/detach interface for an instance.
detach interface will delete the port from neutron(pre-allocate in neutron or allocated by nova),
although there is a patch to preserve pre-allocated port when destroy an instance, this will partly fix detach port being removed( https://review.openstack.org/#/c/126309/), it'll be better to add unbind port api and export this to admin/user, so they can unbind a port without removing it from neutron(no matter pre-allocated or allocated by nova)

think about a case, user create a instance with multiple ports, after some while, user want to detach a interface but keep this port , so we need to add a new api to unbind an interface from a port.

from nova-client we can call:

interface-unbind <server> <port_id>

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Drafter:
Eli Qiao
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Assignee:
Eli Qiao
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Discussion
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