If any two directories of data/commitlog/hints/view_hints
are the same we still end up running verify_owner_and_mode
and disk_sanity(check_direct_io_support) in parallel
on the same directoriea and hit #5510.
This change uses std::set rather than std::vector to
collect a unique set of directories that need initialization.
Fixes#5510
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20191225160645.2051184-1-bhalevy@scylladb.com>
4c884908bb