Fix functional tests after HM change

The health monitor defaults update [1] missed updating a functional
test (they were disabled at the time).  This patch fixes those tests
to reflect the change.

[1] https://review.openstack.org/#/c/381993/

Change-Id: I7cdbd0721e0fa675e662e7930e7e21afbb34f39a
Closes-Bug: #1630287

octavia/tests/functional/api/v1/test_load_balancer.py

@@ -451,9 +451,9 @@ class TestLoadBalancerGraph(base.BaseAPITest):
             'project_id': self._project_id
         }
         expected_hm = {
-            'http_method': None,
-            'url_path': None,
-            'expected_codes': None,
+            'http_method': 'GET',
+            'url_path': '/',
+            'expected_codes': '200',
             'enabled': True
         }
         expected_hm.update(create_hm)