[202205] add missing part in [cherry pick master PR] Improvising pre_…

…checks for test_reload config (#8891)

#8843 missed to cherry-pick change for usage of enum_rand_one_per_hwsku_hostname

regression:

>       duthost = duthosts[rand_one_dut_hostname]
E       NameError: global name 'rand_one_dut_hostname' is not defined

tests/platform_tests/test_reload_config.py

@@ -27,7 +27,7 @@ def test_reload_configuration(duthosts, enum_rand_one_per_hwsku_hostname,
     """
     @summary: This test case is to reload the configuration and check platform status
     """
-    duthost = duthosts[rand_one_dut_hostname]
+    duthost = duthosts[enum_rand_one_per_hwsku_hostname]
     interfaces = conn_graph_facts["device_conn"][duthost.hostname]
     asic_type = duthost.facts["asic_type"]
 
@@ -81,7 +81,7 @@ def test_reload_configuration_checks(duthosts, enum_rand_one_per_hwsku_hostname,
     """
     @summary: This test case is to test various system checks in config reload
     """
-    duthost = duthosts[rand_one_dut_hostname]
+    duthost = duthosts[enum_rand_one_per_hwsku_hostname]
 
     if not config_force_option_supported(duthost):
         return