Recover missing pipeconf-merged driver at component activation

needed to support rebooting ONOS nodes

Change-Id: I44d34c649750ffc3d6b0205ee02c8c88391f1f8a
(cherry picked from commit ccee77a024c14c3cef68457028ea71edc0555f54)
diff --git a/core/api/src/main/java/org/onosproject/net/pi/service/PiPipeconfMappingStore.java b/core/api/src/main/java/org/onosproject/net/pi/service/PiPipeconfMappingStore.java
index 2f275ee..4a9bc90 100644
--- a/core/api/src/main/java/org/onosproject/net/pi/service/PiPipeconfMappingStore.java
+++ b/core/api/src/main/java/org/onosproject/net/pi/service/PiPipeconfMappingStore.java
@@ -31,7 +31,7 @@
 public interface PiPipeconfMappingStore extends Store<PiPipeconfDeviceMappingEvent, PiPipeconfMappingStoreDelegate> {
 
     /**
-     * Retrieves the id of the pipeconf deployed on a given device.
+     * Retrieves the id of the pipeconf associated to a given device.
      *
      * @param deviceId device identifier
      * @return PiPipeconfId