Spec for BSN ML2 external attachment support

Change-Id: I0c37ff8f00d26e050315da1e8073a15bdd09056b

specs/juno/bsn-ml2-ext-attach.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=========================================================
+Big Switch - ML2 external attachment for vlan_switch type
+=========================================================
+
+https://blueprints.launchpad.net/neutron/+spec/bsn-ml2-ext-attach
+
+This spec is to add the ability for the Big Switch ML2 driver to
+configure external attachment points for the vlan_switch type.
+
+
+Problem description
+===================
+
+Once the external attachment point extension[1] is implemented, ML2
+drivers will have the ability to bind external attachment points to
+neutron networks. Since the Big Switch backend has full control over
+the fabric, it can bind physical ports to neutron networks. However,
+the code needs to be added in the ML2 driver to take these calls and
+pass them to the backend controller.
+
+
+
+Proposed change
+===============
+
+Add the appropriate external attachment methods to the Big Switch ML2
+driver to relay the information to the backend controller.
+
+
+Alternatives
+------------
+N/A
+
+
+Data model impact
+-----------------
+N/A
+
+
+REST API impact
+---------------
+N/A
+
+
+Security impact
+---------------
+N/A
+
+
+Notifications impact
+--------------------
+N/A
+
+Other end user impact
+---------------------
+
+N/A
+
+Performance Impact
+------------------
+
+N/A
+
+Other deployer impact
+---------------------
+
+N/A
+
+Developer impact
+----------------
+
+N/A
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  kevinbenton
+
+Work Items
+----------
+
+* Add the relevant methods to the Big Switch ML2 driver to receive the external
+  attachment calls and relay them to the backend controller.
+* Add unit tests
+
+Dependencies
+============
+
+Implementation of external attachment point in the ML2 plugin.[1]
+
+Testing
+=======
+
+Unit tests until a physical testbed can be setup in the 3rd party CI.
+
+
+Documentation Impact
+====================
+
+N/A
+
+References
+==========
+
+1. https://github.com/openstack/neutron-specs/blob/master/specs/juno/neutron-externa    l-attachment-points.rst