fixup, squash me
rgw: bucket index link olh interface

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: new api to retrieve olh log

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: implement rgw_bucket_olh_log_entry::dump()

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw-admin: add olh readlog command

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>