Fix bind_url option in neutron_lbaas service provider metadata

Change-Id: Iaa10730517e0011c0e9da9b8ad54fa556f38be0a
diff --git a/neutron/control/openvswitch/octavia.yml b/neutron/control/openvswitch/octavia.yml
index 783eaa6..9f6345b 100644
--- a/neutron/control/openvswitch/octavia.yml
+++ b/neutron/control/openvswitch/octavia.yml
@@ -9,4 +9,4 @@
           octavia:
             engine: octavia
             driver_path: 'neutron_lbaas.drivers.octavia.driver.OctaviaDriver'
-            base_url: ${_param:octavia_api_bind_address}
+            base_url: http://${_param:octavia_api_bind_address}:9876