small fixes to microsemi adapter.

Change-Id: I5b08ff2dc781543ce063c013edad5aa37d47731e
diff --git a/voltha/adapters/microsemi/microsemi.py b/voltha/adapters/microsemi/microsemi.py
index 8f9454e..bd87ea7 100644
--- a/voltha/adapters/microsemi/microsemi.py
+++ b/voltha/adapters/microsemi/microsemi.py
@@ -98,7 +98,7 @@
                               target=target, device=device_manager)
         activation = ActivationWatcher(iface=self.interface, comm=comm,
                                        target=target, device=device_manager)
-        reactor.callLater(0, self.__init_olt, olt, activation)
+        reactor.callLater(0, self._init_olt, olt, activation)
 
         log.info('adopted-device', device=device)
         # TODO store olt elements
@@ -129,7 +129,7 @@
     ##
     # Private methods
     ##
-    def __init_olt(self, olt, activation_watch):
+    def _init_olt(self, olt, activation_watch):
         olt.runbg()
         activation_watch.runbg()