Fix skipifs and broken tests of the icu extension
Summary: All the tests in hphp/test/slow/ext_icu/icu_49 and hphp/test/slow/ext_icu/icu_latest were skipping due to skipifs with toplevel code. Furthermore, these directories contain the same tests, but with expectations for different versions of icu. We have `INTL_ICU_VERSION === "53.1"` so the icu_49 would never run even with fixed skipifs. Delete hphp/test/slow/ext_icu/icu_49, move the contents of hphp/test/slow/ext_icu/icu_latest into the parent dir, stop checking the version and fix the part of the skipif logic that isn't redundant (hphp/test/slow/ext_icu/skip_unless_locale_fa_IR_present.inc).
Reviewed By: ricklavoie
Differential Revision:
D27938045
fbshipit-source-id:
9ffb3e2c4b0f02e6fb677454e5efb3c3e1c272a1