Brian Goff ac8b4b9a6a Add finer-grained locking for aufs
```
benchmark                       old ns/op       new ns/op     delta
BenchmarkConcurrentAccess-8     10269529748     26834747      -99.74%

benchmark                       old allocs     new allocs     delta
BenchmarkConcurrentAccess-8     309948         7232           -97.67%

benchmark                       old bytes     new bytes     delta
BenchmarkConcurrentAccess-8     23943576      1578441       -93.41%
```

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: f31014197cbe9438cc956ed12c47093a0324c82d
Component: engine
2016-02-25 18:06:41 -05:00
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