[dhcp_relay] fix the compile error introduced by the fixed issue of '#3316', change the sample_output file of 'wait_for_intf.sh' (#3325)

Signed-off-by: wangshengjun <[email protected]>

Author: wangshengjun

src/sonic-config-engine/tests/sample_output/wait_for_intf.sh

@@ -31,11 +31,7 @@ function wait_until_iface_ready
 # Wait for all interfaces to be up and ready
 wait_until_iface_ready ${VLAN_TABLE_PREFIX} Vlan1000
 wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel01
-wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel01
-wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel02
 wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel02
 wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel03
-wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel03
-wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel04
 wait_until_iface_ready ${LAG_TABLE_PREFIX} PortChannel04