Fixed LDAP test case failure in test run

Changes:
   1.Update LDAP Group Name And Verify Operations. 
   2.Update LDAP User Roles And Verify Host Poweroff Operation.

Change-Id: Ia4df02b5b02f0c155f70119210f5223e30991940
Signed-off-by: Anves Kumar rayankula <anvesr77@in.ibm.com>
diff --git a/redfish/account_service/test_ldap_configuration.robot b/redfish/account_service/test_ldap_configuration.robot
index 141d734..38cbffc 100644
--- a/redfish/account_service/test_ldap_configuration.robot
+++ b/redfish/account_service/test_ldap_configuration.robot
@@ -224,7 +224,7 @@
     [Teardown]  Restore LDAP Privilege
 
     # group_name             group_privilege  valid_status_codes
-    ${GROUP_NAME}            Administrator    [${HTTP_OK}]
+    ${GROUP_NAME}            Administrator    [${HTTP_OK}, ${HTTP_NO_CONTENT}]
     ${GROUP_NAME}            Operator         [${HTTP_UNAUTHORIZED}, ${HTTP_FORBIDDEN}]
     ${GROUP_NAME}            ReadOnly         [${HTTP_UNAUTHORIZED}, ${HTTP_FORBIDDEN}]
     ${GROUP_NAME}            NoAccess         [${HTTP_UNAUTHORIZED}, ${HTTP_FORBIDDEN}]
@@ -410,6 +410,7 @@
     [Documentation]  Verify that LDAP user authentication for user not exist
     ...  in LDAP server and fails.
     [Tags]  Verify_LDAP_Authentication_With_Invalid_LDAP_User
+    [Teardown]  Run Keywords  Redfish.Logout  AND  Redfish.Login
 
     ${status}=  Run Keyword And Return Status  Redfish.Login  INVALID_LDAP_USER
     ...  ${LDAP_USER_PASSWORD}