Increase post-PDU state change delay to allow all PSUs to react (soni…

…c-net#13793)

* Increase post-PDU state change delay to allow all PSUs to react

* Revert delay increase for 'turn_all_outlets_on'

tests/platform_tests/test_platform_info.py

@@ -27,6 +27,8 @@
 CMD_PLATFORM_FANSTATUS = "show platform fan"
 CMD_PLATFORM_TEMPER = "show platform temperature"
 
+PDU_WAIT_TIME = 20
+
 THERMAL_CONTROL_TEST_WAIT_TIME = 65
 THERMAL_CONTROL_TEST_CHECK_INTERVAL = 5
 
@@ -296,7 +298,7 @@ def test_turn_on_off_psu_and_check_psustatus(duthosts,
 
         logging.info("Turn off outlet {}".format(outlet))
         pdu_ctrl.turn_off_outlet(outlet)
-        time.sleep(10)
+        time.sleep(PDU_WAIT_TIME)
 
         cli_psu_status = duthost.command(CMD_PLATFORM_PSUSTATUS)
         for line in cli_psu_status["stdout_lines"][2:]:
@@ -310,7 +312,7 @@ def test_turn_on_off_psu_and_check_psustatus(duthosts,
 
         logging.info("Turn on outlet {}".format(outlet))
         pdu_ctrl.turn_on_outlet(outlet)
-        time.sleep(10)
+        time.sleep(PDU_WAIT_TIME)
 
         cli_psu_status = duthost.command(CMD_PLATFORM_PSUSTATUS)
         for line in cli_psu_status["stdout_lines"][2:]: