remove unused files.

- fixed sanity test 57a. It did not work with LMV setup due to unsupported features flag.

renamed to dt_exp and lmv_exp is renamed to md_exp. Related changes.

- removed OBD_MD_FID. And fid is now fetched on MDS on all constructive requests. It
is not fetched on unlink(), rename(), etc. This is because OBD_MD_FID flag lost
the sense as lmv layer needs it for all operations (to check if object is splitted).

- fixes and clanups in cmobd.sh and cobd.sh
- changes in lconf about module loading in OSD and MDSDEV.
- fixes in lconf about mount options forming.
- fixes in lmc about client ref managing.
- fixes in lconf about cmobd and cobd setup.

- changed mds_alloc_inode_sid() to allocate lustre_id in memory if there is
no passed one. This makes mds stuff do not use lustre_id allocated on stack
if there is only need to allocate inode sid without using it later. This
makes stack consumption smaller by 40 bytes in each such a case.

- in mds_setup() whrn comparing strings passed from userspace use strncmp()
- root lustre_id should be set up also in cases when there is no profile.
- making do not use lustre_id allocated on stack in places where it is possible.

- moving mds_finish_transno() calling to place where dput() for dchild is
already called to make sure, that unlink op got to current transaction.

- lots of changes in lconf. MDSDEV stuff is changed substantionaly. Removing
bugs prone code, replacing it by new one about setting up MDS, LMV, etc.
Added more verbose messages about MDS, LMV configuration. Removed redundant
stuff about forming mount options. It now is moved to function and be used from
few places.

- fixes in CMOBD and COBD objects about using LMV.

- fixed double client_ref adding to LMV, what led to double client config
writing on MDS setup.

- returned back sanity-cmobd.sh, whcih was lost after last merge.
- added sanity-fid.sh, which checks fid management correctness.

- fixes in llog_test.c and tests/run-llog.sh. By now sanity.sh test_60 passes.

 - add a flag in lustre_msg which indicate message type
 - add a security descriptor into most of messages send to MDSs, which
   include the uid, supplementary groups array etc.
 - add group hash
 - MDS retrive local groups database through upcall, and set/merge with
   which sent from client based on policies (here not totally finished)
 - move root_squash test into separate sanity-sec.sh

- lsmfs.sh changes to make it usable for testing smfs with no log maintaining.

r=houfeng

- changed for SNMP monitoring

  in OSTCOUNT environment variable

r=adilger

- replay of unlink. landed for testing on china cluster

Handle server recovery in a new thread, instead of tying up request
processing threads. Centralizes the recovery management, including the
abort recovery checking.

I've seen the "server went back in time" message while testing HEAD,
so this will fix that.  Patch already on 1.4.

Use lmv by default for insanity.sh.

update replay-dual.sh and replay-ost-single.sh

- Fix insanity.sh, still using the insanity-local.sh config by default.
- More cleanups in replay-single.sh. We need to generalize failures a
bit more, so we can choose a different mds each time, if more than one
is available.

Fix replay-single.sh and recovery-small.sh so they can run with the
default lmv config or "-f cfg/local.sh" config.

1)some fix for snap
2)add snap_add command

- test 4a of sanity-lmv.sh to check this case

- bunch of fixes to handle dir splitting over N < MDS nodes
  - fixes to MDS code to handle dir splitting over N < MDS nodes properly
  - mds_try_to_split() should ignore requests to split dir over 1 node
  - checks for NULL exports in LMV
  - checks for wrong -ERESTART handling: because of software errors
    it possible that lmv will loop forever. we need to assert on this.
  - one more sanity test 3c to test lfs dirstripe and activity on such a dirs

- cross-node mkdir() splits newly-created directory if requested
- remove_entries_from_orig_dir() accepts cross-node dir entries
- sanity check 3a tests splitting a directory with cross-node entries