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/openpower/ext_interfaces/test_vmi.robot b/openpower/ext_interfaces/test_vmi.robot
index f036d5f..c3782fb 100644
--- a/openpower/ext_interfaces/test_vmi.robot
+++ b/openpower/ext_interfaces/test_vmi.robot
@@ -8,7 +8,7 @@
 Test Teardown     FFDC On Test Case Fail
 Suite Teardown    Run Keyword And Ignore Error  Suite Teardown Execution
 
-Force Tags        Vmi
+Test Tags        Vmi
 
 *** Variables ***