Ensure volumes can be removed when they fail to unmount

Also, ensure that we don't try to mount them without root - it
appears that it can somehow not error and report that mount was
successful when it clearly did not succeed, which can induce this
case.

We reuse the `--force` flag to indicate that a volume should be
removed even after unmount errors. It seems fairly natural to
expect that --force will remove a volume that is otherwise
presenting problems.

Finally, ignore EINVAL on unmount - if the mount point no longer
exists our job is done.

Fixes: #4247
Fixes: #4248

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

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