VOL-3449 Increase UDP packet size for bandwidth test

Change-Id: If0271ee75560d8108de8a3b3699e9dfa4673da54
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index 640f9e7..009b269 100644
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -58,7 +58,7 @@
 ${upper_margin_pct}      105     # Allow 5% over the limit
 ${lower_margin_pct}      92      # Allow 8% under the limit
 ${udp_rate_multiplier}   1.10    # Send UDP at bw profile limit * rate_multiplier
-${udp_packet_bytes}      1400    # UDP payload in bytes
+${udp_packet_bytes}      1470    # UDP payload in bytes
 
 # Per-test logging on failure is turned off by default; set this variable to enable
 ${container_log_dir}    ${None}