DMTF Tools: Handled DMTF Tools Download If Branch Name Was Different

Changes:

    - Recently, In DMTF Tools website for few of tools repository stable branch name was changed from master to main.
    - Handled Download DMTF Tools keyword, to download dmtf tool from their respective stable branch.

Tested:
     - Ran All The Scripts Successfully

Change-Id: I7d86799051a95df4728bd728a9c90bdbe0107dad
Signed-off-by: ganesanb <ganesanb@ami.com>
diff --git a/redfish/dmtf_tools/Redfish_Reference_Checker.robot b/redfish/dmtf_tools/Redfish_Reference_Checker.robot
index a9a80f1..1911171 100644
--- a/redfish/dmtf_tools/Redfish_Reference_Checker.robot
+++ b/redfish/dmtf_tools/Redfish_Reference_Checker.robot
@@ -18,6 +18,8 @@
 ${command_string}  ${DEFAULT_PYTHON} ${rsv_dir_path}${/}RedfishReferenceTool.py
 ...                --nochkcert 'https://${OPENBMC_HOST}:${HTTPS_PORT}/redfish/v1/$metadata'
 
+${branch_name}    main
+
 *** Test Case ***
 
 Test BMC Redfish Reference
@@ -36,5 +38,5 @@
     [Documentation]  Do test case setup tasks.
 
     Printn
-    Download DMTF Tool  ${rsv_dir_path}  ${rsv_github_url}
+    Download DMTF Tool  ${rsv_dir_path}  ${rsv_github_url}  ${branch_name}