LU-4416 utils: loop_control device support

LU-4416 utils: loop_control device support

FC19 use loop_control device since 3.12.5 kernel.

Signed-off-by: yang sheng <yang.sheng@intel.com>
Change-Id: I40b241243507648b7dd9c6ddaf924c2324396e3f
Reviewed-on: http://review.whamcloud.com/8799
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Reviewed-by: Peng Tao <bergwolf@gmail.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>