[tz] Test case for tzdata parsers

If you maintain a zoneinfo parser, I suggest testing it on the attached file tzdata.zi, which I built automatically by running 'make tzdata.zi'. This text file is in standard (albeit abbreviated) zic format and contains all the default tzdata. Further shrinking of tzdata.zi can be done once we start assuming tzcode 2015f and later, so that tzdata.zi can use "%z" instead of spelling out numeric abbreviations.