use assignment instead of memset to clear the conn_cnt.

  move primary cowed inode to cowed dir.
2)move MSG_CONNECT_INITIAL check before obd_uuid equal check, otherwise,
  it will bring some problems in cmobd_setup.
3)set imp_conn_cnt to 0 in ptlrpc_disconnect_import

2)some minor fix in smfs cache_hook.

robert's fixes:
 - add CONNECT_INITAL flag for the initial connect message from a client.  When
   server sees an old client reconnect with that flag, then it needs to set the
   handles as if it was a new client.

 - set the initial imp_conn_cnt from the server's conn_cnt. When client
   connects with INITIAL set, the server sends back the old conn_cnt+1.

 - timeout for inter-MDS requests is set to obd_timeout / 2

- mds_open() logs parent/name couple. this helps recovery debugging

1) fix some bugs in create_indirect inode.

1) add IOC_OBD_SNAP_ADD
3) mirror s_flags in sb for P_DIROPS

1)some fix for snap
2)add snap_add command

1)some fix in fsfilt_snap_ext3 and fsfilt_snap_smfs.
2)add smfs_cow.c in smfs.
3)remove snapfs in Makefile.in and configure.in

  #8 from CMD acceptance series

VS: ----------------------------------------------------------------------

  lock on part of dir only
- minor API changes to pass the lock pointer

- configure script sets HAVE_LOOKUP_RAW if kernel has the feature

  then it doesn't take exclusive lock on it; in the meantime another client
  can enlarge directory and 1st client will run splitting w/o exclusive lock

- additional debug message

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

  this should prevent lookup serialization
- vfs-pdirops-2.4.20-rh.patch exports lock_dir() and unlock_dir() primitives

lock handle which was never used

the group field, which LASSERTs on the OST.

striping default code was removed from mds_crceate_objects

r=rread
A quick workaround for bug 3652, in which we hold the logging
semaphore across an rpc.  Robert thinks that this file can be cleaned
up substantially, but that this fix is sufficient for CMD.

- 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

for can not delete lmv/*.o when 'make clean'