[merge][#130574] avoid epipe error from shutdown code

[Martin Pool]

https://bugs.launchpad.net/ubuntu/+source/bzr/+bug/130574
Bug #130574, first reported on 2007-08-06  by  Scott Kitterman
Interrupting bzr log causes "bzr crashed with IOError in <module>()"

I thought this should be handled by display_command, which is used by
cmd_log and tries to arrange to ignore epipe errors.  However, it
looks like it's hit again when we flush the file and so we should
ignore it from the top level too.

-- 
Martin
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