LU-5409 obd: add CFS_FAULT_CHECK()

LU-5409 obd: add CFS_FAULT_CHECK()

Add the macro CFS_FAULT_CHECK() which behaves like CFS_FAIL_CHECK()
except that any site may be matched by setting CFS_FAULT (0x02000000)
in cfs_fail_loc. Add cfs_fail_err for use as a return value with
CFS_FAULT_CHECK(). Add fault injection points to the DT object
operation wrappers using CFS_FAULT_CHECK().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I9841dbe0c62a13107c62382c8d7a73af207b1ef4
Reviewed-on: http://review.whamcloud.com/11263
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Robert Read <robert.read@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>