Switch from Force Tags to Test Tags

Force Tags is deprecated in Robot 7.0 and will eventually
warn and then after that stop working. Test Tags performs
the same function per docs.

Change-Id: I7cf305754b247b995a05d8da3b9de9ed613ecae2
Signed-off-by: Matt Fischer <matthew.fischer@hpe.com>
diff --git a/openpower/ras/test_bmc_ras.robot b/openpower/ras/test_bmc_ras.robot
index 81c56d6..e90ac08 100755
--- a/openpower/ras/test_bmc_ras.robot
+++ b/openpower/ras/test_bmc_ras.robot
@@ -19,7 +19,7 @@
 Test Teardown       FFDC On Test Case Fail
 Suite Teardown      RAS Suite Cleanup
 
-Force Tags          BMC_RAS
+Test Tags          BMC_RAS
 
 *** Variables ***
 ${stack_mode}       normal