Fix test cases name tags under redfish directory

Change-Id: Icec85bd3b11f541c185a9242191096774d04290e
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/dmtf_tools/test_redfishtool_certificate.robot b/redfish/dmtf_tools/test_redfishtool_certificate.robot
index 8fbf5d6..5c84b62 100644
--- a/redfish/dmtf_tools/test_redfishtool_certificate.robot
+++ b/redfish/dmtf_tools/test_redfishtool_certificate.robot
@@ -129,7 +129,7 @@
 
 Install Server Certificate Using Redfishtool And Verify Via OpenSSL
     [Documentation]  Install server certificate using Redfishtool and verify via OpenSSL.
-    [Tags]  Install_Server_Certificate_Using_Redfishtool_And_Verify_Via_OpenSSL.
+    [Tags]  Install_Server_Certificate_Using_Redfishtool_And_Verify_Via_OpenSSL
 
     ${cert_file_path}=  Generate Certificate File Via Openssl  Valid Certificate Valid Privatekey
     ${bytes}=  OperatingSystem.Get Binary File  ${cert_file_path}