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/security/test_slp.robot b/security/test_slp.robot
index f0892f3..2436276 100644
--- a/security/test_slp.robot
+++ b/security/test_slp.robot
@@ -9,7 +9,7 @@
 # Get the SLP services available, make it suite global.
 Suite Setup     Suite Setup Execution
 
-Force Tags  SLP_Service_Test
+Test Tags  SLP_Service_Test
 
 *** Variables ***
 ${service_types}    findsrvtypes