Use 0ms delay on latency tests

Using the larger delay appears to have negative side affects on AMD

Signed-off-by: Jack Thomson <jackabt@amazon.com>

tests/integration_tests/performance/test_network_ab.py

@@ -62,7 +62,7 @@ def test_network_latency(network_microvm, metrics):
 
     rounds = 15
     request_per_round = 30
-    delay = 0.2
+    delay = 0.0
 
     metrics.set_dimensions(
         {