Fix HTTPS_PORT user define port input

Resolves  openbmc/openbmc-test-automation#2145

Change-Id: Id4f71266c66949574e3f07330c873b8dea6a5d08
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/dmtf_tools/Redfish_Reference_Checker.robot b/redfish/dmtf_tools/Redfish_Reference_Checker.robot
index 5421930..5d4582d 100644
--- a/redfish/dmtf_tools/Redfish_Reference_Checker.robot
+++ b/redfish/dmtf_tools/Redfish_Reference_Checker.robot
@@ -16,7 +16,7 @@
 ${rsv_dir_path}           Redfish-Reference-Checker
 
 ${command_string}  ${DEFAULT_PYTHON} ${rsv_dir_path}${/}RedfishReferenceTool.py
-...                --nochkcert 'https://${OPENBMC_HOST}:443/redfish/v1/$metadata'
+...                --nochkcert 'https://${OPENBMC_HOST}:${HTTPS_PORT}/redfish/v1/$metadata'
 
 *** Test Case ***