relocate applypatch; check patch integrity

- Delete the applypatch code (it's being moved to bootable/recovery).

- Change the OTA script generator to verify the sha1sum of all the
  patch files after they are unpacked into /tmp.

b/2361316 - VZW Issue PP628: Continuous reset to Droid logo:
            framework-res.apk update failed (CR LIBtt59130)

Change-Id: I5858d48f10127f72e708d50d3de844569d1aff27