Phil Estes 4467c80b95 Use real chroot if daemon is running in a user namespace
The namespace unshare+pivot root is not possible when running inside a
user namespace, so fallback to the original "real" chroot code.

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
Upstream-commit: dc950567c105153c0a2f8b40d16b989bbddcdb3c
Component: engine
2016-08-12 16:31:01 -04:00
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