Provide configuration file to ovs-cleanup utility

There may be cases when the configuration of the OVS is different
from the default one. This enables one to make use of the neutron
configuration file to contain all of the OVS settings.

Change-Id: I728cf8cdc653667c076b07b39c13c1278281c01b
Closes-bug: #1645691
diff --git a/lib/neutron_plugins/ovs_base b/lib/neutron_plugins/ovs_base
index baf7d7f..1004325 100644
--- a/lib/neutron_plugins/ovs_base
+++ b/lib/neutron_plugins/ovs_base
@@ -30,7 +30,7 @@
 
 function _neutron_ovs_base_setup_bridge {
     local bridge=$1
-    neutron-ovs-cleanup
+    neutron-ovs-cleanup --config-file $NEUTRON_CONF
     _neutron_ovs_base_add_bridge $bridge
     sudo ovs-vsctl --no-wait br-set-external-id $bridge bridge-id $bridge
 }
@@ -97,7 +97,7 @@
         iniset $Q_L3_CONF_FILE DEFAULT external_network_bridge $PUBLIC_BRIDGE
     fi
 
-    neutron-ovs-cleanup
+    neutron-ovs-cleanup --config-file $NEUTRON_CONF
     if [[ "$Q_USE_PUBLIC_VETH" = "True" ]]; then
         ip link show $Q_PUBLIC_VETH_INT > /dev/null 2>&1 ||
         sudo ip link add $Q_PUBLIC_VETH_INT type veth \