This prevents mounts in the plugins dir from leaking into other
namespaces which can prevent removal (`device or resource busy`),
particularly on older kernels.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
(cherry picked from commit 0c2821d6f2de692d105e50a399daa65169697cca)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>