Remove duplicate keys from dictionary

There are a few places where duplicate keys are defined in the
dictionary. Removed all such occurrences throughout the code.

TrivialFix

Change-Id: I40cd400b26745927698584a8376971f9884acbf8

contrib/rackspace/rackspace/tests/test_cloud_loadbalancer.py

@@ -347,7 +347,6 @@ class LoadBalancerTest(common.HeatTestCase):
             "protocol": u'HTTP',
             "port": 80,
             "virtual_ips": [FakeVirtualIP(type=u"PUBLIC", ipVersion=u"IPV6")],
-            "halfClosed": None,
             "algorithm": u'LEAST_CONNECTIONS',
             "connectionThrottle": {'maxConnectionRate': 1000,
                                    'maxConnections': None,

heat/tests/openstack/nova/test_server.py

@@ -3257,7 +3257,6 @@ class ServersTest(common.HeatTestCase):
             {'port': 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa',
              'network': None,
              'fixed_ip': None,
-             'uuid': None,
              'subnet': None,
              'port_extra_properties': None,
              'uuid': None},