This design doc adds details about how the autoconfiguration of
openvswitch should work in the cluster <-> node group <-> node
hierarchy. Parameters that are needed for succesful configration
are idenfied and inheritance of parameters is defined.

Also, some rephrasing of the definition in the first part of the
document. After looking into gnt-network, in my opinion it is not the
right place to put the switch management into, since it has more to
do with links and nics than with network names and addresses.

Signed-off-by: Sebastian Gebhard <sege@fs.ei.tum.de>
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>