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/network/test_network_nping.robot b/network/test_network_nping.robot
index 7155cc9..6d1e72a 100644
--- a/network/test_network_nping.robot
+++ b/network/test_network_nping.robot
@@ -8,7 +8,7 @@
 
 Suite Setup  Suite Setup Execution
 
-Force Tags  Network_Nping
+Test Tags  Network_Nping
 
 *** Variables ***