promise.plugin: fix test ipv6_is_faster failing when ping outside is not possible

slapos/test/promise/plugin/test_check_re6st_optimal_status.py

@@ -62,7 +62,13 @@ extra_config_dict = {
     result = self.getPromiseResult(self.promise_name)
     last_message = result['result']['message'].split('\n')[-1]
     self.assertEqual(result['result']['failed'], False)
-    self.assertEqual(last_message, "OK: IPv4 reachable, IPv6 reachable")
+    #self.assertEqual(last_message, "OK: IPv4 reachable, IPv6 reachable")
+    # some testnodes cannot ping because they are qemu VM with Nat network, and
+    # ICMP is disabled. Expected result is "OK: IPv4 reachable, IPv6 reachable"
+    # but it ICMP is not working, we will have "IPv4 unreachable" in the message
+    # so we will test only if the ping returned "OK" and if IPv6 was reachable.
+    self.assertTrue(last_message.startswith("OK:"))
+    self.assertTrue("IPv6 reachable" in last_message)
 
   def test_ipv4_is_faster(self):
     content = self.base_content % {