Merge master@afb003dd7f into kernel.build.lnx.1.0

https://android.googlesource.com/platform/system/tools/mkbootimg

:
  unpack_bootimg: Refactor unpack_vendor_boot_image()
  mkbootimg_test: Generate stronger testdata with random()
  repack_bootimg: creates parent dirs for the copy-to files
  repack_bootimg: support legacy boot.img format
  Change the type of the "default" vendor ramdisk to VENDOR_RAMDISK_TYPE_PLATFORM

Change-Id: Ie10c6cc6aca3834db2e53dd5a0a9a1e6d2d763e8
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>