[sheepdog] [PATCH] sheep: don't panic on reading broken epoch file

[Hitoshi Mitake]

At Fri, 29 Mar 2013 19:07:07 +0800,
Liu Yuan wrote:
> 
> From: Liu Yuan <tailai.ly at taobao.com>
> 
> Just ignore it, sheep can handle failure case
> 

The problem was added in my previous commit, thanks a lot for your
fix!
Hitoshi