land zcfg on devel

land zcfg on devel

- includes changes from b_llogging

- the MDS -> LOV connection is created using the MDS config log, so the
  log must exist. Lconf will create the log automatically when
  --reformat is used. To create the config logs on an existing
  filesystem, run lconf on the MDS with --write_conf. This only needs to
  be done on the MDS.

- LOV does not connect to the MDS during setup.  Instead, the MDS and
  MDC use obd_get_info("lovdesc") to get the stripe info. The LOVDESC
  and LOVTGTS files on the MDS are no longer used (and not created
  on new filesystems.)

- Zeroconf clients are new support by lconf --zeroconf, and
  replay-single.sh uses this to mount the client.  The exact arguments
  needed for zeroconf will be changing quickly, so don't use
  lconf --zeroconf in other scripts yet.  Instead, once the dust
  clears, lconf will be changed to always do zeroconf mounts, and
  eventually when don't need lconf anymore is when we start changing
  the test scripts.