LU-4679 liblustre: remove dead code and clean headers

LU-4679 liblustre: remove dead code and clean headers

In liblustre, remove statically unused functions, varaibles and
macros. Also ensure that the headers needed by the c and h files are
included at top level. Prune unneeded includes. In libsysio, include
sys/queue.h in fs.h.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I878b442b6d0ae17d8d5d33375ca7596618323c52
Reviewed-on: http://review.whamcloud.com/9429
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>