Remove trailing whitespace.

port Adaptive Timeouts from b1_6 to HEAD.
b=14071
r=nathan
r=adilger

b=15521
r=adilger, bobijam

fix the wrong lprcfs stats

b=14529
i=adilger
i=panda

Description: MDS or OSS nodes crash due to stack overflow
Details    : Code changes in 1.8.0 increased the stack usage of some functions.
             In some cases, in conjunction with device drivers that use a lot
             of stack the MDS (or possibly OSS) service threads could overflow
             the stack.  One change which was identified to consume additional
             stack has been reworked to avoid the extra stack usage.

b=12974
i=nikita
i=adilger

1) set as "inline" for such large function ("obd_fail_check()") is not suitable,
   replaced with normal function "__obd_fail_check_set()".
2) atomic operations for obd_fail_count (replace "static count" in obd_fail_check).
3) use "test_and_set_bit()" for "OBD_FAILED/OBD_FAIL_ONCE" check and set to avoid
   unexpected racing condition between multi-thread ops.
4) some cleanup for OBD_FAIL_XXX macro.

b=12211
i=green, adilger

Description: make lustre randomly fail allocating memory
Details    : Make lustre randomly failed allocating memory for testing purpose.