LU-7486 obdclass: health_check to report unhealthy upon LBUG

LU-7486 obdclass: health_check to report unhealthy upon LBUG

When a LBUG has occured, without panic_on_lbug being set, health_check
/proc file must return an unhealthy state.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: I3fb89fe825cb3e85f2be99609141131aef6b6af7
Reviewed-on: http://review.whamcloud.com/17981
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>