[backport 17.07] Overlay fix for IP reuse #1913
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Prevents an issue where the goroutine may jump to a new OS thread during execution putting it into a mount/network NS that is unexpected. Signed-off-by: Brian Goff <cpuguy83@gmail.com> (cherry picked from commit 65bb58f) Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>
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Backport fix that ensure proper OS thread locking: #1911