Use instance 0 for first replica of P4RT clone groups

Some switch implementations do not support non-zero values

Change-Id: I6fb7e9075fe0c6f48448f43c58054e03f4e9781b
(cherry picked from commit 8767511609393c7d4b3aa63700c0c6957096a245)
diff --git a/core/net/src/main/java/org/onosproject/net/pi/impl/PiReplicationGroupTranslatorImpl.java b/core/net/src/main/java/org/onosproject/net/pi/impl/PiReplicationGroupTranslatorImpl.java
index 1f562a4..53fb9d2 100644
--- a/core/net/src/main/java/org/onosproject/net/pi/impl/PiReplicationGroupTranslatorImpl.java
+++ b/core/net/src/main/java/org/onosproject/net/pi/impl/PiReplicationGroupTranslatorImpl.java
@@ -118,7 +118,7 @@
             // Use incremental instance IDs for replicas of the same port.
             replicaMap.putIfAbsent(port, Sets.newHashSet());
             replicaMap.get(port).add(
-                    new PiPreReplica(port, replicaMap.get(port).size() + 1));
+                    new PiPreReplica(port, replicaMap.get(port).size()));
         }
         return replicaMap.values().stream()
                 .flatMap(Collection::stream)