Account for the fact that iptables-save outputs rules with a space at the end.

Reverse the rule deduplication so that the last one takes precedence.

nova/tests/test_network.py

@@ -118,6 +118,7 @@ COMMIT
 
         seen_lines = set()
         for line in new_lines:
+            line = line.strip()
             self.assertTrue(line not in seen_lines,
                             "Duplicate line: %s" % line)
             seen_lines.add(line)
@@ -151,6 +152,7 @@ COMMIT
 
         seen_lines = set()
         for line in new_lines:
+            line = line.strip()
             self.assertTrue(line not in seen_lines,
                             "Duplicate line: %s" % line)
             seen_lines.add(line)