Performance improvements for ZooKeeper

                 Key: ZOOKEEPER-639
             Project: Zookeeper
          Issue Type: Improvement
          Components: server
            Reporter: Benjamin Reed

here are some more improvements to Zab. the patch is a bit stale, but i don't 
want to lose track of it. there are two big improvements:

1) transaction logs are reused. this saves time over growing the log files and 
if you preallocate a bunch of log files on an empty partition, you will see a 
nice performance boost
2) acks and commits are always sent in order, so if there is a bunch to send, 
they will get merged into a single ack or commit.

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