In ML2/OVN there is a static common configuration parameter to define
if the routers (more in particular the floating IPs) can be distributed
or centralized:
[ovn] enable_distributed_floating_ip
This patch writes this value on each new router created. It also
implements a maintenance method to populate this flag when the
Neutron API is restarted and the value changed.
Closes-Bug: #2022058
Change-Id: Ib109b09fde4db8738c1d0b3e394c201492d210c6
1f1824397d