b=11270

i=vitaly.vertman
i=oleg.drokin

Lockless i/o code fixes and improvements:
 (1) lockless truncate checks for OBD_CONNECT_TRUNCLOCK and ll_file_punch
     sets OBD_FL_TRUNCLOCK correctly.
 (2) an lproc control for lockless truncate,
     lproc statistics for lockless truncate.
 (3) sanityN tests for lockless code