[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/vendor/modules.txt b/vendor/modules.txt
index c3dbb73..7f32653 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -63,7 +63,7 @@
 github.com/mitchellh/go-homedir
 # github.com/mitchellh/mapstructure v1.1.2
 github.com/mitchellh/mapstructure
-# github.com/opencord/voltha-lib-go/v3 v3.0.6
+# github.com/opencord/voltha-lib-go/v3 v3.0.8
 github.com/opencord/voltha-lib-go/v3/pkg/adapters
 github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif
 github.com/opencord/voltha-lib-go/v3/pkg/adapters/common