The initial spec for address scope and subnetpool support mentioned
support for dual-stack. This commit extends the existing spec to
define that support.
Change-Id: I0966d200c75c1d571a15687062020528e97648da
Partially-implements: blueprint address-scope-mapping
Starting in the Mitaka release Neutron defines and supports the use of Address
Scopes. Subnet-pools were defined in the earlier Kilo release and can now be
used within Address Scopes. The notion of an address scope has existed in GBP
in the form of L3-Policy. The GBP L3-Policy manages the address-scope and
subnet-pools with its own home-grown implementation. It would be preferable to
leverage the Neutron address-scopes and subnet-pools instead.
Change-Id: I9e4335073dc8ec0cb85db909560c49e0dddefe82
Defines: blueprint address-scope-mapping