Always add OVS port in _move_neutron_addresses_route

Added functionallity to allow _move_neutron_addresses_route to support
interfaces without a configured IP address. If PUBLIC_INTERFACE is set
to an interface without a configured IP, only the port will be
added to the OVS_PHYSICAL_BRIDGE.

Change-Id: I511ea5229ab871298086af5c96761390529bd85e
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 4069439..4bbc802 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -793,7 +793,8 @@
 }
 
 # _move_neutron_addresses_route() - Move the primary IP to the OVS bridge
-# on startup, or back to the public interface on cleanup
+# on startup, or back to the public interface on cleanup. If no IP is
+# configured on the interface, just add it as a port to the OVS bridge.
 function _move_neutron_addresses_route {
     local from_intf=$1
     local to_intf=$2
@@ -806,7 +807,8 @@
         # on configure we will also add $from_intf as a port on $to_intf,
         # assuming it is an OVS bridge.
 
-        local IP_BRD=$(ip -f $af a s dev $from_intf | awk '/inet/ { print $2, $3, $4; exit }')
+        local IP_ADD=""
+        local IP_DEL=""
         local DEFAULT_ROUTE_GW=$(ip r | awk "/default.+$from_intf/ { print \$3; exit }")
         local ADD_OVS_PORT=""
 
@@ -826,7 +828,12 @@
             ADD_OVS_PORT="sudo ovs-vsctl --may-exist add-port $to_intf $from_intf"
         fi
 
-        sudo ip addr del $IP_BRD dev $from_intf; sudo ip addr add $IP_BRD dev $to_intf; $ADD_OVS_PORT; $ADD_DEFAULT_ROUTE
+        if [[ "$IP_BRD" != "" ]]; then
+            IP_ADD="sudo ip addr del $IP_BRD dev $from_intf"
+            IP_DEL="sudo ip addr add $IP_BRD dev $to_intf"
+        fi
+
+        $IP_ADD; $IP_DEL; $ADD_OVS_PORT; $ADD_DEFAULT_ROUTE
     fi
 }
 
@@ -834,9 +841,7 @@
 # runs that a clean run would need to clean up
 function cleanup_neutron {
 
-    if [[ $(ip -f inet a s dev "$OVS_PHYSICAL_BRIDGE" | grep -c 'global') != 0 ]]; then
-        _move_neutron_addresses_route "$OVS_PHYSICAL_BRIDGE" "$PUBLIC_INTERFACE" False "inet"
-    fi
+    _move_neutron_addresses_route "$OVS_PHYSICAL_BRIDGE" "$PUBLIC_INTERFACE" False "inet"
 
     if [[ $(ip -f inet6 a s dev "$OVS_PHYSICAL_BRIDGE" | grep -c 'global') != 0 ]]; then
         _move_neutron_addresses_route "$OVS_PHYSICAL_BRIDGE" "$PUBLIC_INTERFACE" False "inet6"
@@ -1021,9 +1026,7 @@
 
     neutron_plugin_configure_l3_agent
 
-    if [[ $(ip -f inet a s dev "$PUBLIC_INTERFACE" | grep -c 'global') != 0 ]]; then
-        _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" True "inet"
-    fi
+    _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" True "inet"
 
     if [[ $(ip -f inet6 a s dev "$PUBLIC_INTERFACE" | grep -c 'global') != 0 ]]; then
         _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" False "inet6"