Unmount rootfs with separate Remove() in bundle
Unmount rootfs with separate Remove() in bundle

This ensures that a container does not have a mounted rootfs in the
bundle directory before RemoveAll is called.  Having the rootfs removed
first with a Remove ensures that the directory is not mounted and empty
before the bundle directory is removed.

Signed-off-by: Michael Crosby <951f4c7b5d47e32d0112c78d14a98eaa23e6b5ef@gmail.com>

dmcgowan/containerd,estesp/containerd,crosbymichael/containerd,mikebrow/containerd,dmcgowan/containerd,estesp/containerd,vdemeester/containerd,vdemeester/containerd,thaJeztah/containerd,containerd/containerd,containerd/containerd,crosbymichael/containerd,thaJeztah/containerd,mikebrow/containerd