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/redfish/managers/test_bmc_network_mac.robot b/redfish/managers/test_bmc_network_mac.robot
index 82240e4..b20f6b0 100644
--- a/redfish/managers/test_bmc_network_mac.robot
+++ b/redfish/managers/test_bmc_network_mac.robot
@@ -9,7 +9,7 @@
 Suite Setup    Suite Setup Execution
 Test Teardown  Test Teardown Execution
 
-Force Tags     Bmc_Network_Mac
+Test Tags     Bmc_Network_Mac
 
 *** Variables ***