CronExpression.getNextValidTimeAfter() yields incorrect result for last-day-of-month cron expressions

[mma-ivu]

This seems to be an issue introduced in release 2.5.0, likely with #1175 - "L" is not handled correctly for some months, e.g. February. A simple repro follows:

    @Test
    void testCronExpression() throws Exception {
        CronExpression cronExpression = new CronExpression("0 0 11 L * ?");
        Date nextValidTime = cronExpression.getNextValidTimeAfter(new Date(2017 - 1900, Calendar.FEBRUARY, 28, 5, 0));
        // nextValidTime should be the Feb 28, 2017, but instead is "Fri Mar 31 11:00:00 CEST 2017"
    }

[mma-ivu]

Possibly / probably fixed with #1284 ?

[curegit]

Possibly / probably fixed with #1284 ?

Yes. I fixed these cases in #1284 .