rbd-replay: Add --anonymize flag to rbd-replay-prep

Signed-off-by: Adam Crume <adamcrume@gmail.com>
librbd: Add missing tracepoints

Signed-off-by: Adam Crume <adamcrume@gmail.com>
rbd-replay: Add rbd-replay-many

Signed-off-by: Adam Crume <adamcrume@gmail.com>
rbd-replay: Add --dump-perf-counters option

Signed-off-by: Adam Crume <adamcrume@gmail.com>
rbd-replay: Add code documentation

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