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_conf.robot b/redfish/managers/test_bmc_network_conf.robot
index bf26541..bd0ffef 100644
--- a/redfish/managers/test_bmc_network_conf.robot
+++ b/redfish/managers/test_bmc_network_conf.robot
@@ -13,7 +13,7 @@
 Test Setup      Test Setup Execution
 Test Teardown   Test Teardown Execution
 
-Force Tags     Bmc_Network_Conf
+Test Tags     Bmc_Network_Conf
 
 *** Variables ***
 ${test_hostname}           openbmc