[Sheepdog] [PATCH v2] add some candy helpers

[Liu Yuan]

These candy helpers are spin-offs from the development "Farm". I don't know
when Farm will be released, so I think it would be useful for other dev to include
these helerps in early. Most are taken from Linux kernel, git.

Thanks,
Yuan

v2 changes:
 - drop simple slab allocator
 - drop hash_long(), use fnv_64a_buf() as kazum suggested.
 - add xpread, xpwrite helpers.

 Liu Yuan (4):
      sheep: modify Makefile.am for candy helpers.
      sheep: add some candy helpers in util.c
      sheep: add string buf candy helpers
      sheep: add hlist candy helpers

 include/list.h           |  116 +++++++++++++++++++++++++
 include/sheepdog_proto.h |    7 ++
 include/util.h           |   14 +++
 sheep/Makefile.am        |    4 +-
 sheep/strbuf.c           |  192 +++++++++++++++++++++++++++++++++++++++++
 sheep/strbuf.h           |   95 ++++++++++++++++++++
 sheep/util.c             |  214 ++++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 640 insertions(+), 2 deletions(-)