openpower: Update test suite Force tags as per standard

Changes:
   - Update Tags names for the test suite

Note: Refer CONTRIBUTING.md for under Tags section
      documentation.

Tested:
   - NA

Change-Id: Id4a4131fec754fb106f47b4a0598715f94fd098d
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/openpower/service_account/test_service_user.robot b/openpower/service_account/test_service_user.robot
index 78c5a5a..273aa8e 100644
--- a/openpower/service_account/test_service_user.robot
+++ b/openpower/service_account/test_service_user.robot
@@ -9,6 +9,7 @@
 Suite Teardown   Redfish.Logout
 Test Teardown    FFDC On Test Case Fail
 
+Force Tags       Service_User
 
 *** Test Cases ***