A fix for bmv2 adding multicast node with a list of ports

port_to_port_map_str.patch

diff --git a/targets/simple_switch/sswitch_CLI.py b/targets/simple_switch/sswitch_CLI.py
index f67fc5f..eb0165c 100644
--- a/targets/simple_switch/sswitch_CLI.py
+++ b/targets/simple_switch/sswitch_CLI.py
@@ -41,6 +41,8 @@ class SimpleSwitchAPI(runtime_CLI.RuntimeAPI):
 def main():
     args = runtime_CLI.get_parser().parse_args()
 
+    args.pre = runtime_CLI.PreType.SimplePreLAG
+
     runtime_CLI.load_json(args.json)
 
     services = runtime_CLI.RuntimeAPI.get_thrift_services(args.pre)
diff --git a/tools/runtime_CLI.py b/tools/runtime_CLI.py
index 84dadb9..f1d0bea 100755
--- a/tools/runtime_CLI.py
+++ b/tools/runtime_CLI.py
@@ -586,13 +586,15 @@ class RuntimeAPI(cmd.Cmd):
         print "SUCCESS"
 
     def ports_to_port_map_str(self, ports):
-        last_port_num = 0
-        port_map_str = ""
-        for port_num_str in ports:
-            port_num = int(port_num_str)
-            port_map_str += "0" * (port_num - last_port_num) + "1"
-            last_port_num = port_num
-        return port_map_str[::-1]
+        port_list = map(int, ports)
+        if not port_list:
+            return ""
+        max_port = max(port_list) + 1
+        port_map = [0]*max_port
+        for p in port_list:
+            port_map[p] = 1
+        port_map_str = "".join(str(x) for x in port_map[::-1])
+        return port_map_str
 
     def parse_ports_and_lags(self, args):
         ports = []