Implemented Openstack Neutron SFC API

Signed-off-by: Malte Splietker <malte.splietker@gmail.com>
diff --git a/src/emuvim/dcemulator/net.py b/src/emuvim/dcemulator/net.py
index 7efb3f0..faa090b 100755
--- a/src/emuvim/dcemulator/net.py
+++ b/src/emuvim/dcemulator/net.py
@@ -568,7 +568,7 @@
                 pass
 
 
-        cmd = kwargs.get('cmd')
+        cmd = kwargs.get('cmd', 'add-flow')
         if cmd == 'add-flow' or cmd == 'del-flows':
             ret = self._chainAddFlow(vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, **kwargs)
             if kwargs.get('bidirectional'):