systemvm: do not arping None

If the gateway is None, don't bother arping it.

Author: Romain Dartigues

systemvm/patches/debian/config/opt/cloud/bin/cs/CsAddress.py

@@ -584,6 +584,8 @@ def hasIP(self, ip):
         return ip in self.address.values()
 
     def arpPing(self):
+        if not self.address['gateway'] or self.address['gateway'] == 'None':
+            return
         cmd = "arping -c 1 -I %s -A -U -s %s %s" % (
             self.dev, self.address['public_ip'], self.address['gateway'])
         CsHelper.execute(cmd)