one big fix:

one big fix:
- in osc_create, set oa->o_id AFTER copying oscc_oa overtop of it, so
  that we don't give every new file object 6

lots of little fixes:
- call mds_lov_set_nextid() from the end of mds_postsetup()
- ...make that safe by calling mds_lov_connect() at the beginning of
  mds_lov_set_nextid()
- in filter_create, stop holding the directory lock for reply acks.
  it's not needed anymore, and causes obvious deadlock during precreation
- clean up the error handling in filter_precreate
- start precreating when there are fewer than "kick_barrier" objects
  remaining, and then create "grow_count" additional objects

moving on to larger tests:
- initial_create_count is now 100
- kick_barrier is now 50
- grow_count is now 100