Description of ML2 BaGpipe BGP driver configuration options

Configuration option = Default value	Description
[ml2_bagpipe]
as_number = 64512	(IntOpt) Autonomous System number
[ml2_type_route_target]
rt_asn = 64512	(IntOpt) Route Target Autonomous System number.
rt_nn_ranges =	(ListOpt) Comma-separated list of <rt_nn_min>:<rt_nn_max> tuples enumerating ranges of Route Target number that are available for tenant network allocation