Fixed JSON output for stray OSDs
doc: correct command of `config push`

Signed-off-by: VRan Liu <gliuwr@gmail.com>
Cleanup up useless method release in MultiAioCompletionImpl. It was exactly equivalent to put
Fixed part of the seg fault described in bug 9356 by adding reference counting on RadosReadCompletionData
Fixed remaning part of the seg fault described in bug 9356 by adding reference counting to CompletionData
Added missing semaphore in libradosstriper AIO tests leading to potential memory corruption and thus test failures