reverted ObjectCacher changes

[Sage Weil <sage@xxxxxxxxxxx>]

I reverted the recent changes to ObjectCacher.  The problem is in 
flush_set:

  set<BufferHead*>::iterator next, it;
  next = it = dirty_or_tx_bh.begin();
  while (it != dirty_or_tx_bh.end()) {
    next++;
    BufferHead *bh = *it;
    waitfor_commit.insert(bh->ob);
    bh_write(bh);
    it = next;
  }

This resubmits IOs for writes that are already in flight.  The fs client 
in particular calls this a lot, overwhelming the OSDs with dup IOs and 
stalling out completely.  See

 /a/sage-2014-07-25_17:14:20-fs-wip-msgr-testing-basic-plana

for a bunch of sample failures.

Probably easy to fix, but simply reverting for now!

sage


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