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Protect aufs mounts with locks

Parallel aufs mount calls produce invalid argument error.

Fixes #21545

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit 824c24e6802ad3ed7e26b4f16e5ae81869b98185)
T
Tonis Tiigi committed
8facb73a8fa544a2324f70d406c773cc5f0dae86
Parent: c4fa814
Committed by Tibor Vass <tibor@docker.com> on 3/31/2016, 10:35:02 PM