Update SRBridging tests for sdfabric-ci1 POD

And remove Tucson-relaed configs

Change-Id: I2f57d99ba3ec6a4bbb0c3456c506464d81eae8ba
diff --git a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.py b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.py
index 1606e1b..697a3ee 100644
--- a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.py
+++ b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.py
@@ -1248,7 +1248,8 @@
 
     def CASE56( self, main ):
         """
-        Tests connectivity between two untagged hosts with different vlan id
+        Tests connectivity between two untagged hosts with different vlan id,
+        hosts should not be able to ping each other.
         (Ports are configured as vlan-untagged 10 and 20, respectively)
 
         Sets up 3 ONOS instances