ONOS-4975 Fixed potential for IOB exception in intent perf installer.

Change-Id: Ia0af1dbbad586a4c64883e20b80cb1ffbe251cd4
diff --git a/apps/test/intent-perf/src/main/java/org/onosproject/intentperf/IntentPerfInstaller.java b/apps/test/intent-perf/src/main/java/org/onosproject/intentperf/IntentPerfInstaller.java
index e839fde..104d9c7 100644
--- a/apps/test/intent-perf/src/main/java/org/onosproject/intentperf/IntentPerfInstaller.java
+++ b/apps/test/intent-perf/src/main/java/org/onosproject/intentperf/IntentPerfInstaller.java
@@ -425,7 +425,7 @@
         private Iterable<Intent> subset(Set<Intent> intents) {
             List<Intent> subset = Lists.newArrayList(intents);
             Collections.shuffle(subset);
-            return subset.subList(0, lastCount);
+            return subset.subList(0, Math.min(intents.size(), lastCount));
         }
 
         // Submits the specified intent.