ConnectionHandler.writer can die without setting writer_stopped

[nekto0n]

Here's the trace with kazoo-0.8:

Traceback (most recent call last):
  File "/home/nekto0n/.local/lib/python2.7/site-packages/gevent/greenlet.py", line 390, in run
    result = self._run(*self.args, **self.kwargs)
  File "/home/nekto0n/.local/lib/python2.7/site-packages/kazoo/protocol/connection.py", line 397, in writer
    retry.increment()
  File "/home/nekto0n/.local/lib/python2.7/site-packages/kazoo/retry.py", line 54, in increment
    raise Exception("Too many retry attempts")
Exception: Too many retry attempts

[hannosch]

I've wrapped the loop inside a try/finally, so the writer_stopped should always be set. I've also changed the exception raised inside the retry.increment into a more specialized exception (SHA1: 1763ed8) - which should make it easier to react to it.

[hannosch]

I've wrapped the loop inside a try/finally, so the writer_stopped should always be set. I've also changed the exception raised inside the retry.increment into a more specialized exception (SHA1: 1763ed8) - which should make it easier to react to it.