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This simply calls into mountfsd to acquire the root mount and uses it as root for the container. Note that this also makes one more change: previously we ran containers directory off their backing directory. Except when we didn't, and there were a variety of exceptions: if we had no privs, if we ran off a disk image, if the directory was the host's root dir, and some others. This simplifies the logic a bit: we now simply always create a temporary directory in /tmp/ and bind mount everything there, in all code paths. This simplifies our code a bit. After all, in order to control propagation we need to turn the root into a mount point anyway, hence we might just do it at one place for all cases.
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