Justin Cormack c1c71a7f68 Allow overriding the default mount options
This refactors the mount handling, without changing any defaults.

Any specification of a mount destination will override the default,
so if you want to make `sysfs` read only you can add

```
mounts:
  - type: sysfs
    options: ["ro"]
```

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
2017-04-05 15:00:13 +01:00
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