Adding init script for the warden.

Change-Id: I2789f802aaf1a2b79162a888994bb941d0d5c1b9
diff --git a/utils/warden/src/main/java/org/onlab/warden/Warden.java b/utils/warden/src/main/java/org/onlab/warden/Warden.java
index 3f2caba..0469a7f 100644
--- a/utils/warden/src/main/java/org/onlab/warden/Warden.java
+++ b/utils/warden/src/main/java/org/onlab/warden/Warden.java
@@ -71,7 +71,7 @@
      */
     Warden() {
         random.setSeed(System.currentTimeMillis());
-        timer.schedule(new Reposessor(), MINUTE / 4, MINUTE);
+        timer.schedule(new Reposessor(), MINUTE / 4, MINUTE / 2);
     }
 
     /**