validation of an ip if an ip term starts with a zero

tiramisu/option.py

@@ -786,6 +786,12 @@ class IPOption(Option):
                                        warnings_only=warnings_only)
 
     def _validate(self, value):
+        # sometimes an ip term starts with a zero
+        # but this does not fit in some case, for example bind does not like it
+        for val in value.split('.'):
+            if val.startswith("0") and len(val)>1:
+                raise ValueError(_('invalid IP'))
+        # 'standard' validation
         try:
             IP('{0}/32'.format(value))
         except ValueError: