Make olt device REACHABLE after olt reboot/re-connect

Change-Id: I2c7e68f3f8449f522ab68b7159b978e5fddfea6e
diff --git a/voltha/adapters/openolt/openolt_data_model.py b/voltha/adapters/openolt/openolt_data_model.py
index 3dd635e..e69f514 100644
--- a/voltha/adapters/openolt/openolt_data_model.py
+++ b/voltha/adapters/openolt/openolt_data_model.py
@@ -116,6 +116,7 @@
 
     def olt_oper_up(self):
         self.device.parent_id = self.logical_device_id
+        self.device.connect_status = ConnectStatus.REACHABLE
         self.device.oper_status = OperStatus.ACTIVE
         self.adapter_agent.update_device(self.device)