systemvm: Set gateway to empty than None to avoid arping

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: Luiz.Machado

systemvm/debian/opt/cloud/bin/merge.py

@@ -236,7 +236,7 @@ def processCLItem(self, num, nw_type):
                 if('localgw' in self.qFile.data['cmd_line']):
                     dp['gateway'] = self.qFile.data['cmd_line']['localgw']
                 else:
-                    dp['gateway'] = 'None'
+                    dp['gateway'] = ''
             dp['nic_dev_id'] = num
             dp['nw_type'] = nw_type
             qf = QueueFile()