Kai Qiang Wu(Kennan) 250b4af05c Add ecryptfs check for overlay2
We added docs about ecryptfs check but not in code side.
Also refactor code to make it clean.

Signed-off-by: Kai Qiang Wu(Kennan) <wkqwu@cn.ibm.com>
Upstream-commit: 136323b04315eceffbed61d680878ed23cecc015
Component: engine
2016-06-14 14:25:52 +00:00
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