Modular Layer 2 (ml2) GRE Type configuration options

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Table 9.15. Description of ML2 GRE configuration options
Configuration option = Default value	Description
[ml2_type_gre]
`tunnel_id_ranges` =	(ListOpt) Comma-separated list of <tun_min>:<tun_max> tuples enumerating ranges of GRE tunnel IDs that are available for tenant network allocation