VOL-1453:  yield adapter_agent/core_proxy call updated api

ONU now can proceed past activation and add PON port.
omci agent started and ready
Waiting on onu_indication from olt to "create_interface"
and start openomci state machines.

Change-Id: I90995cfcffb7926b273ea71e4432d891a364d36f
diff --git a/python/adapters/brcm_openomci_onu/brcm_openomci_onu.py b/python/adapters/brcm_openomci_onu/brcm_openomci_onu.py
index 6d58703..31ba20c 100644
--- a/python/adapters/brcm_openomci_onu/brcm_openomci_onu.py
+++ b/python/adapters/brcm_openomci_onu/brcm_openomci_onu.py
@@ -89,7 +89,7 @@
     def omci_agent(self):
         if not hasattr(self, '_omci_agent') or self._omci_agent is None:
             log.debug('creating-omci-agent')
-            self._omci_agent = OpenOMCIAgent(self.adapter_agent.core,
+            self._omci_agent = OpenOMCIAgent(self.adapter_agent,
                                              support_classes=self.broadcom_omci)
         return self._omci_agent