Switch DateUtils.formatDateRange over to an icu4c-based implementation.

Bug: 7289514
Change-Id: Ia382f49aa23737bde91b7891d95545da084ec57c
Merge "Switch DateUtils.formatDateRange over to an icu4c-based implementation."
Merge pull request #1 from android/master

Merge it.
Merge pull request #2 from X-ROM/jb3

merge it