libnih: Add OWNERS and DIR_METADATA

We need OWNERS and DIR_METADATA files.

libnih is for upstart and ureadahead, so I borrow upstart's OWNERS and
platform2/init's DIR_METADATA.

BUG=b:341759381
TEST=none

Change-Id: I37e98a12586951f740b284c2819f101ed8a83376
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libnih/+/5620734
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
2 files changed