[VOL-3058][VOL-3059][VOL-3615] Multi-OLT framework changes and updated ATT, DT, TT existing tests accordingly

Change-Id: Iad0a6d4fba3c2bf647b8a844413e8d16405cd121
diff --git a/tests/data/bbsim-kind-dt.yaml b/tests/data/bbsim-kind-dt.yaml
index 6309371..3747263 100644
--- a/tests/data/bbsim-kind-dt.yaml
+++ b/tests/data/bbsim-kind-dt.yaml
@@ -37,6 +37,7 @@
   src:
     -
       onu: 'BBSM00000001'
+      olt: 'BBSIM_OLT_0'
       c_tag: '4096'
       s_tag: '900'