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/systest/network_stability_test.robot b/systest/network_stability_test.robot
index 6f52ff0..af2daca 100755
--- a/systest/network_stability_test.robot
+++ b/systest/network_stability_test.robot
@@ -8,7 +8,7 @@
 Test Setup      Test Setup Execution
 Test Teardown   Test Teardown Execution
 
-Force Tags      Network_Stability
+Test Tags      Network_Stability
 
 *** Variables ****