extras/benchmarking: port glfs-bm.c to master.
extras/benchmarking: port glfs-bm.c to master.

Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 422 (port glfs-bm to latest code-base)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=422

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster