Only open_by_handle_at requires CAP_DAC_READ_SEARCH.
This allows systemd to run with only `--cap-add SYS_ADMIN`
rather than having to also add `--cap-add DAC_READ_SEARCH`
as well which it does not really need.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
Upstream-commit: c1ca124682a90f3306b34ad104ba80e413f7bf88
Component: engine