Drop RpcProxy usage from cisco apic ml2 plugin

Drop usage fo the RpcProxy compatibility class from the cisco apic ml2
plugin.  The equivalent oslo.messaging APIs are now used instead.

Part of blueprint drop-rpc-compat.

Change-Id: I415b65720a09652bae70fc1c1dada9f5727c4441

neutron/plugins/ml2/drivers/cisco/apic/apic_topology.py

@@ -21,6 +21,7 @@
 eventlet.monkey_patch()
 
 from oslo.config import cfg
+from oslo import messaging
 
 from neutron.agent.common import config
 from neutron.agent.linux import ip_lib
@@ -138,30 +139,21 @@ def update_link(self, context,
                 self.peers[(host, interface)] = nlink
 
 
-class ApicTopologyServiceNotifierApi(rpc.RpcProxy):
-
-    RPC_API_VERSION = '1.1'
+class ApicTopologyServiceNotifierApi(object):
 
     def __init__(self):
-        super(ApicTopologyServiceNotifierApi, self).__init__(
-            topic=TOPIC_APIC_SERVICE,
-            default_version=self.RPC_API_VERSION)
+        target = messaging.Target(topic=TOPIC_APIC_SERVICE, version='1.0')
+        self.client = rpc.get_client(target)
 
     def update_link(self, context, host, interface, mac, switch, module, port):
-        self.fanout_cast(
-            context, self.make_msg(
-                'update_link',
-                host=host, interface=interface, mac=mac,
-                switch=switch, module=module, port=port),
-            topic=TOPIC_APIC_SERVICE)
+        cctxt = self.client.prepare(version='1.1', fanout=True)
+        cctxt.cast(context, 'update_link', host=host, interface=interface,
+                   mac=mac, switch=switch, module=module, port=port)
 
     def delete_link(self, context, host, interface):
-        self.fanout_cast(
-            context, self.make_msg(
-                'delete_link',
-                host=host, interface=interface, mac=None,
-                switch=0, module=0, port=0),
-            topic=TOPIC_APIC_SERVICE)
+        cctxt = self.client.prepare(version='1.1', fanout=True)
+        cctxt.cast(context, 'delete_link', host=host, interface=interface,
+                   mac=None, switch=0, module=0, port=0)
 
 
 class ApicTopologyAgent(manager.Manager):