Modified host discovery to suppress discovery of self-assigned IP addresses.

Change-Id: I40e7c20a6f5b76abe9d9481a135581431e8fcd9f

@@ -289,7 +289,7 @@ public class HostLocationProvider extends AbstractProvider implements HostProvid
         private void updateLocationIP(HostId hid, MacAddress mac,
                                       VlanId vlan, HostLocation hloc,
                                       IpAddress ip) {
-            HostDescription desc = ip.isZero() ?
+            HostDescription desc = ip.isZero() || ip.isSelfAssigned() ?
                     new DefaultHostDescription(mac, vlan, hloc) :
                     new DefaultHostDescription(mac, vlan, hloc, ip);
             try {

@@ -294,7 +294,7 @@ public class IpAddress implements Comparable<IpAddress> {
     /**
      * Check if this IP address is zero.
      *
-     * @return true if this address is zero.
+     * @return true if this address is zero
      */
     public boolean isZero() {
         for (byte b : octets) {
@@ -305,6 +305,15 @@ public class IpAddress implements Comparable<IpAddress> {
         return true;
     }
 
+    /**
+     * Check if this IP address is self-assigned.
+     *
+     * @return true if this address is self-assigned
+     */
+    public boolean isSelfAssigned() {
+        return isIp4() && octets[0] == (byte) 169;
+    }
+
     @Override
     public int compareTo(IpAddress o) {
         // Compare first the version

@@ -758,6 +758,17 @@ public class IpAddressTest {
     }
 
     /**
+     * Tests if address is self-assigned for IPv4.
+     */
+    @Test
+    public void testIsSelfAssignedIpv4() {
+        IpAddress normalIP = IpAddress.valueOf("10.0.0.1");
+        IpAddress selfAssignedIP = IpAddress.valueOf("169.1.2.3");
+        assertFalse(normalIP.isSelfAssigned());
+        assertTrue(selfAssignedIP.isSelfAssigned());
+    }
+
+    /**
      * Tests comparison of {@link IpAddress} for IPv4.
      */
     @Test