init dnfs

git-svn-id: http://code.taobao.org/svn/dnfs/trunk@1 73e0a288-f8d2-49ac-9843-74d52946d175
dnfs code

git-svn-id: http://code.taobao.org/svn/dnfs/trunk@2 73e0a288-f8d2-49ac-9843-74d52946d175
Merge branch 'master' of github.com:zydcom/dnfs