fix encap_ip will be lost when we restart the ovs-dpdk node (#2543)

Co-authored-by: yuanliu <yuanliu@cmss.chinamobile.com>

Author: 2 people

dist/images/start-ovs-dpdk-v2.sh

@@ -103,11 +103,12 @@ esac
 
 ovs-vsctl set port ${DPDK_TUNNEL_IFACE} tag=${VLAN_TAG}
 
-ip addr add ${ENCAP_IP} dev ${DPDK_TUNNEL_IFACE}
 fi
 
 ip link set ${DPDK_TUNNEL_IFACE} up
 
+ip addr replace ${ENCAP_IP} dev ${DPDK_TUNNEL_IFACE}
+
 ovs-vsctl --may-exist add-br br-int \
   -- set Bridge br-int datapath_type=netdev \
   -- br-set-external-id br-int bridge-id br-int \