* Fixed IP_TOS match problem.

In MatchUtils.java where the IP_TOS match string is converted into ECN and DSCP fields, incorrect values were passed into each fields constructor. To fix the problem, the ECN and DSCP bits had to be isolated and then passed into each constructor.

* Fixed a bug that had to do with the order of bitwise operations when dealing with IP_TOS matches. By adding parenthesis, we ensure that the 'and' is done before the 'shift'.