LU-9405 utils: remove device path parsing from mount.lustre

LU-9405 utils: remove device path parsing from mount.lustre

In mount_utils_ldiskfs.c remove code that analyzes the device path
(/dev/mdXX, /dev/mdXXpX, /dev/mapper/XXX, /dev/loopX ...) to determine
the device type and replace with use of stat(). Locate the device's
sysfs directory using the /sys/dev/block/<major>:<minor> symlink
rather than globbing. Rename set_blockdev_tunables() to
tune_block_dev() and break into subfunctions to handle setting
md/stripe_cache_size, queue/max_sectors_kb, and queue/scheduler.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ibd272bdf2e76bdec4c207c29dff76a96a65ea333
Reviewed-on: https://review.whamcloud.com/26909
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>