Added support for one portChannel and one routed interface if two por…

…tChannels or two roured interface don't exist on the dut

tests/crm/conftest.py

@@ -97,9 +97,13 @@ def crm_interface(duthosts, enum_rand_one_per_hwsku_frontend_hostname, tbinfo, e
     elif len(mg_facts["minigraph_portchannel_interfaces"]) >= 4:
         crm_intf1 = mg_facts["minigraph_portchannel_interfaces"][0]["attachto"]
         crm_intf2 = mg_facts["minigraph_portchannel_interfaces"][2]["attachto"]
-    else:
+    elif len(mg_facts["minigraph_interfaces"]) > 2:
         crm_intf1 = mg_facts["minigraph_interfaces"][0]["attachto"]
         crm_intf2 = mg_facts["minigraph_interfaces"][2]["attachto"]
+    else:
+        # Assuming that we have atleast one portchannel and one interface - like in min T2 topology
+        crm_intf1 = mg_facts["minigraph_portchannel_interfaces"][0]["attachto"]
+        crm_intf2 = mg_facts["minigraph_interfaces"][0]["attachto"]
     yield (crm_intf1, crm_intf2)