BGP AS number issue fixes.

Change-Id: I204fdbc4f54917448b79bba453015f64283da125
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BgpOpenMsg.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BgpOpenMsg.java
index f762852..a8f48cb 100644
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BgpOpenMsg.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BgpOpenMsg.java
@@ -47,7 +47,7 @@
      *
      * @return AS Number of Open Message
      */
-    short getAsNumber();
+    long getAsNumber();
 
     /**
      * Returns BGP Identifier of Open Message.