Changed type of term number and sequence number to long.

Change-Id: If90663fa9567988752f8c4af17daeff904865ab7
diff --git a/core/api/src/main/java/org/onosproject/mastership/MastershipTerm.java b/core/api/src/main/java/org/onosproject/mastership/MastershipTerm.java
index b2c0e41..b1e3503 100644
--- a/core/api/src/main/java/org/onosproject/mastership/MastershipTerm.java
+++ b/core/api/src/main/java/org/onosproject/mastership/MastershipTerm.java
@@ -24,14 +24,14 @@
 public final class MastershipTerm {
 
     private final NodeId master;
-    private final int termNumber;
+    private final long termNumber;
 
-    private MastershipTerm(NodeId master, int term) {
+    private MastershipTerm(NodeId master, long term) {
         this.master = master;
         this.termNumber = term;
     }
 
-    public static MastershipTerm of(NodeId master, int term) {
+    public static MastershipTerm of(NodeId master, long term) {
         return new MastershipTerm(master, term);
     }
 
@@ -39,7 +39,7 @@
         return master;
     }
 
-    public int termNumber() {
+    public long termNumber() {
         return termNumber;
     }