Eliminate tab character from datastore package

Change-Id: I6eea92ce72268c4ca90f1bd24bdccf7edf4cbb7f
diff --git a/src/main/java/net/onrc/onos/datastore/ObjectExistsException.java b/src/main/java/net/onrc/onos/datastore/ObjectExistsException.java
index 3ac3bf8..8ce6055 100644
--- a/src/main/java/net/onrc/onos/datastore/ObjectExistsException.java
+++ b/src/main/java/net/onrc/onos/datastore/ObjectExistsException.java
@@ -9,17 +9,17 @@
     private static final long serialVersionUID = -1488647215779909457L;
 
     public ObjectExistsException(final String message) {
-	super(message);
+        super(message);
     }
 
     public ObjectExistsException(final IKVTableID tableID, final byte[] key,
-	    final Throwable cause) {
-	super(ByteArrayUtil.toHexStringBuffer(key, ":")
-	        + " already exist on table:" + tableID, cause);
+            final Throwable cause) {
+        super(ByteArrayUtil.toHexStringBuffer(key, ":")
+                + " already exist on table:" + tableID, cause);
     }
 
     public ObjectExistsException(final IKVTableID tableID, final byte[] key) {
-	super(ByteArrayUtil.toHexStringBuffer(key, ":")
-	        + " already exist on table:" + tableID);
+        super(ByteArrayUtil.toHexStringBuffer(key, ":")
+                + " already exist on table:" + tableID);
     }
 }