Added no messages option to blkparse.c

Added no messages option to blkparse.c

Added a new option (-M, --no-msgs) option to blkparse: I have found that
the CFQ I/O scheduler sends a *tremendous* amount of messages, that
bloat the .bin file generated when using the -d option. The file sizes
can shrink by >50% when using the -M option in those case.

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>