[VOL-2364] handle sub-sequent onuDiscoveryIndication

If ChildDeviceDetected times out then the device never receives the
"enable" call. With this patch we are allowing the device to send a new
discovery indication to retry the process (the OpenOlt agent keeps
sending discovery until an "enable" call is received for that device)

Change-Id: I6a2f5d5e9b0a001361bdca1feb14ca22cf092138
diff --git a/go.sum b/go.sum
index 0ca681b..2eea07f 100644
--- a/go.sum
+++ b/go.sum
@@ -196,8 +196,8 @@
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