Remove delete port commands in ovs agent init

This commit removes 'del-port' commands in neutron ovs
agent init script. Since, 'add-bond' command allows
modification of the existing options, the commands
being removed are not required. This also allows to
avoid disruptions in ovs caused by deleting ports on
restart.

Change-Id: I7201b87da7b20e1ca8efedf5d86a23123ccfa150

neutron/templates/bin/_neutron-openvswitch-agent-init.sh.tpl

@@ -197,8 +197,6 @@ function process_dpdk_nics {
 
     bind_dpdk_nic ${target_driver} "${dpdk_pci_id}"
 
-    ovs-vsctl --db=unix:${OVS_SOCKET} --if-exists del-port ${port_name}
-
     dpdk_options=""
     ofport_request=$(get_dpdk_config_value ${nic} '.ofport_request')
     if [ -n "${ofport_request}" ]; then
@@ -331,7 +329,6 @@ function process_dpdk_bonds {
       fi
     done < /tmp/nics_array
 
-    ovs-vsctl --db=unix:${OVS_SOCKET} --if-exists del-port "${bond_name}"
     ovs-vsctl --db=unix:${OVS_SOCKET} --may-exist add-bond "${dpdk_bridge}" "${bond_name}" \
       ${nic_name_str} \
       "${ovs_options}" ${dev_args_str}