Currently stack.sh will fail if a value is set for
default_ipv4_subnet_pool and/or default_ipv6_subnet_pool in
neutron.conf. This is because setting either of these values
overrides the default behaviour of using the implicit (none)
subnetpool for subnet creation, and the subnetpools
specified in neutron.conf have not been created at the time
of the devstack calls to subnet-create.
This patch fixes the failure by specifying subnetpool = None
in calls to subnet-create, so that neutron will behave as
devstack expects. This parameter will no longer be required
once these configuration options are removed in the OpenStack
N release, but will be required for compatibility with Kilo,
Liberty, and Mitaka.
Change-Id: I29b2d62a022b43f6623b127af2ca303f9de847b0
Closes-Bug: #1472200
8a3b7d424d