Fix findbugs warning in Upgrade421to430.java Was creating Integer to assign to int

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

This closes #419

engine/schema/src/com/cloud/upgrade/dao/Upgrade421to430.java

@@ -157,7 +157,7 @@ public class Upgrade421to430 implements DbUpgrade {
             if (resultSet.next()) {
                 port = DBEncryptionUtil.decrypt(resultSet.getString(1));
                 if (StringUtils.isNotBlank(port)) {
-                    portNumber = Integer.valueOf(port);
+                    portNumber = Integer.parseInt(port);
                 }
             }
             pstmt.close();