lttng: Trace OpRequest

Signed-off-by: Adam Crume <adamcrume@gmail.com>
lttng: Add rmw_flags to tracepoint in PG::queue_op

Signed-off-by: Adam Crume <adamcrume@gmail.com>
lttng: Trace ReplicatedPG::do_osd_ops

Signed-off-by: Adam Crume <adamcrume@gmail.com>
lttng: Add tracing-common.h

Signed-off-by: Adam Crume <adamcrume@gmail.com>
lttng: Trace librados C API

Signed-off-by: Adam Crume <adamcrume@gmail.com>