Bump up the LISP LCAF version from draft 13 to draft 20

Change-Id: Ie99331c56a39c4f32226cd8f15bd27fa48802243
diff --git a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSourceDestLcafAddress.java b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSourceDestLcafAddress.java
index 954c2b4..08d9205 100644
--- a/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSourceDestLcafAddress.java
+++ b/protocols/lisp/msg/src/main/java/org/onosproject/lisp/msg/types/LispSourceDestLcafAddress.java
@@ -28,8 +28,8 @@
 /**
  * Source/Dest key type LCAF address class.
  * <p>
- * Source destination key type is defined in draft-ietf-lisp-lcaf-13
- * https://tools.ietf.org/html/draft-ietf-lisp-lcaf-13#page-18
+ * Source destination key type is defined in draft-ietf-lisp-lcaf-20
+ * https://tools.ietf.org/html/draft-ietf-lisp-lcaf-20#page-19
  *
  * <pre>
  * {@literal
@@ -38,7 +38,7 @@
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |           AFI = 16387         |     Rsvd1     |     Flags     |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |   Type = 12   |     Rsvd2     |             4 + n             |
+ * |   Type = 12   |     Rsvd2     |             Length            |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |            Reserved           |   Source-ML   |    Dest-ML    |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+