Restore NEUTRON_CREATE_INITIAL_NETWORKS flag
Restore NEUTRON_CREATE_INITIAL_NETWORKS flag

Somehow this feature was lost in the transition
from q-svc to neutron-api. This patch does not
modify the default behavior but allows specifying
the flag to false to prevent devstack from creating
the public and private networks.

Change-Id: I952672496d007552c0c4d83db0d0df9be50326fc
Signed-off-by: Josh <478499ed8b5e86dc1977051a0592139e98ea4c1c@redhat.com>

nawawi/openstack,dtroyer/devstack,noironetworks/devstack,openstack-dev/devstack,dtroyer/devstack,group-policy/devstack,noironetworks/devstack,openstack-dev/devstack,group-policy/devstack,nawawi/openstack