Support for configuring/starting multiple switches in cord-tester.
Useful to fire tests with multiple switches configured with num_ports as per olt_config.json.

Change-Id: Ifbe65c75ad008db75ac5f4e3554e36499cb194de
diff --git a/src/test/setup/olt_config.json b/src/test/setup/olt_config.json
index 36070f7..844b4fe 100644
--- a/src/test/setup/olt_config.json
+++ b/src/test/setup/olt_config.json
@@ -1 +1 @@
-{ "olt" : false , "port_map" : { "num_ports" : 11, "host" : "br-int", "start_vlan" : 1000 }, "uplink" : 2, "vlan" : 0 }
+{ "olt" : false , "port_map" : { "num_ports" : 11, "start_vlan" : 1000, "nr_switches": 1 }, "uplink" : 2, "vlan" : 0 }