Pipe: avoid redundancy new/delete for struct iovec

Signed-off-by: Haomai Wang <haomaiwang@gmail.com>
ObjectStore: Add "need_journal" interface to make aware of journal device

Impl feature #9580

Signed-off-by: Haomai Wang <haomaiwang@gmail.com>
Merge pull request #2608 from yuyuyu101/pipe-iovec

Pipe: avoid redundancy new/delete for struct iovec

Reviewed-by: Sage Weil <sage@redhat.com>
Merge pull request #2607 from yuyuyu101/wip-9580

ObjectStore: Add "need_journal" interface to make aware of journal devic...

Reviewed-by: Sage Weil <sage@redhat.com>
osd: fix need_journal call

From 2955b3da4e2c472c18b45e81eba791f8ccd58061

Signed-off-by: Sage Weil <sage@redhat.com>
doc: A couple of fixes to the CloudStack documentation