Port Status in ODL was previously disabled due to bugs which have now
been resolved. This patch enables it via Neutron ML2 conf. Port status
is communicated by ODL through a websocket connection on port 8185.
Therefore we need to enable haproxy to load balance across that port.
Related-Bug: 1718508
Change-Id: Iebdcc6404f5503eeb45b39380b3f198be175514b
Signed-off-by: Tim Rozet <trozet@redhat.com>