NO-JIRA: Fix for potential Timer deadlock issue:

- Previously we used a mutex to prevent cancelling a TimerTask whilst it
  was still executing from within its callback in another thread.

  This violates the principle that you shouldn't hold locks when calling
  the arbitrary code in a callback, and so is subject to potential
  deadlock problems.

- This fix only works if no timer callback calls TimerTask::cancel();
  this is true with the current code. And there is no good reason to
  call cancel() from within a callback, as cancel is the default
  behviour in any case - you have to specifically reschedule a
  recurring timer.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1357827 13f79535-47bb-0310-9956-ffa450edef68

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