SEBA-450 Update Att-Workflow-Driver to use synchronizer library

Change-Id: I86740c694950e86f2d7afea6221d33e2aad8aeef
diff --git a/xos/synchronizer/event_steps/dhcp_event.py b/xos/synchronizer/event_steps/dhcp_event.py
index 1b3033a..ab411f7 100644
--- a/xos/synchronizer/event_steps/dhcp_event.py
+++ b/xos/synchronizer/event_steps/dhcp_event.py
@@ -17,8 +17,7 @@
 import time
 import os
 import sys
-from synchronizers.new_base.eventstep import EventStep
-from synchronizers.new_base.modelaccessor import VOLTService, RCORDSubscriber, model_accessor
+from xossynchronizer.event_steps.eventstep import EventStep
 from helpers import AttHelpers
 
 class SubscriberDhcpEventStep(EventStep):
@@ -31,8 +30,8 @@
     def process_event(self, event):
         value = json.loads(event.value)
 
-        onu_sn = AttHelpers.get_onu_sn(self.log, value)
-        si = AttHelpers.get_si_by_sn(self.log, onu_sn)
+        onu_sn = AttHelpers.get_onu_sn(self.model_accessor, self.log, value)
+        si = AttHelpers.get_si_by_sn(self.model_accessor, self.log, onu_sn)
 
         if not si:
             self.log.exception("dhcp.events: Cannot find att-workflow-driver service instance for this event", kafka_event=value)