test: Print the same formatted message before running iperf

The integration tests for rate limiter run iperf command multiple times
for different configurations. Printing the same formatted message before
every iperf run improves readability.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

tests/integration_tests/performance/test_rate_limiter.py

@@ -144,7 +144,7 @@ def _check_tx_rate_limiting(test_microvm):
 
     # First step: get the transfer rate when no rate limiting is enabled.
     # We are receiving the result in KBytes from iperf.
-    print("Run guest TX iperf with no rate-limit")
+    print("Run guest TX iperf for no rate limiting")
     rate_no_limit_kbps = _get_tx_bandwidth_with_duration(
         test_microvm, eth0.host_ip, IPERF_TRANSMIT_TIME
     )
@@ -160,11 +160,12 @@ def _check_tx_rate_limiting(test_microvm):
     assert _get_percentage_difference(rate_no_limit_kbps, expected_kbps) > 100
 
     # Second step: check bandwidth when rate limiting is on.
+    print("Run guest TX iperf for rate limiting without burst")
     _check_tx_bandwidth(test_microvm, eth1.host_ip, expected_kbps)
 
     # Third step: get the number of bytes when rate limiting is on and there is
     # an initial burst size from where to consume.
-    print("Run guest TX iperf with exact burst size")
+    print("Run guest TX iperf for rate limiting with burst")
     # Use iperf to obtain the bandwidth when there is burst to consume from,
     # send exactly BURST_SIZE packets.
     iperf_cmd = "{} -c {} -n {} -f KBytes -w {} -N".format(
@@ -192,7 +193,7 @@ def _check_rx_rate_limiting(test_microvm):
 
     # First step: get the transfer rate when no rate limiting is enabled.
     # We are receiving the result in KBytes from iperf.
-    print("Run guest RX iperf with no rate-limit")
+    print("Run guest RX iperf with no rate limiting")
     rate_no_limit_kbps = _get_rx_bandwidth_with_duration(
         test_microvm, eth0.guest_ip, IPERF_TRANSMIT_TIME
     )
@@ -208,11 +209,12 @@ def _check_rx_rate_limiting(test_microvm):
     assert _get_percentage_difference(rate_no_limit_kbps, expected_kbps) > 100
 
     # Second step: check bandwidth when rate limiting is on.
+    print("Run guest RX iperf for rate limiting without burst")
     _check_rx_bandwidth(test_microvm, eth1.guest_ip, expected_kbps)
 
     # Third step: get the number of bytes when rate limiting is on and there is
     # an initial burst size from where to consume.
-    print("Run guest RX iperf with exact burst size")
+    print("Run guest RX iperf for rate limiting with burst")
     # Use iperf to obtain the bandwidth when there is burst to consume from,
     # send exactly BURST_SIZE packets.
     iperf_cmd = "{} {} -c {} -n {} -f KBytes -w {} -N".format(