fix physical id should not be 'UNKNOWN'

Closes-Bug #1710834

Change-Id: I3c5e7212440f348f292b53d34332781581eb09d7

senlin/profiles/os/nova/server.py

@@ -849,7 +849,7 @@ class ServerProfile(base.Profile):
                 kwargs['scheduler_hints'] = hints
 
         server = None
-        resource_id = 'UNKNOWN'
+        resource_id = None
         try:
             server = self.compute(obj).server_create(**kwargs)
             self.compute(obj).wait_for_server(server.id)

senlin/tests/unit/profiles/test_nova_server.py

@@ -491,7 +491,7 @@ class TestNovaServerBasic(base.SenlinTestCase):
         cc.wait_for_server.side_effect = err
         ex = self.assertRaises(exc.EResourceCreation, profile.do_create,
                                node_obj)
-
+        self.assertEqual('FAKE_ID', ex.resource_id)
         self.assertEqual('Failed in creating server: TIMEOUT.',
                          six.text_type(ex))
         cc.wait_for_server.assert_called_once_with('FAKE_ID')
@@ -522,6 +522,7 @@ class TestNovaServerBasic(base.SenlinTestCase):
         # assertions
         self.assertEqual('Failed in creating server: creation failed.',
                          six.text_type(ex))
+        self.assertIsNone(ex.resource_id)
         self.assertEqual(0, cc.wait_for_server.call_count)
         self.assertEqual(0, mock_zone_info.call_count)