In previous releases neutron L3 agent was configured statically
to manage only br-ex as provider network. This way of configuring
neutron is being deprecated in neutron and it has been removed
from puppet-neutron in https://review.openstack.org/#/c/423625/.
This patch changes neutron configuration to a new mode where a
single L3 agent is able to manage multiple provider networks.
To implement it, a new parameter CONFIG_NEUTRON_OVS_EXTERNAL_PHYSNET
has been introduced. Default configuration has been modify to preserve the
existing behavior, creating a public network attached to br-ex bridge.
Change-Id: I71677a5d456ec8748e36f2191f247c96fa578d7d
e649710c78