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If Chrome crashes while crostini is running, old mount points for the
sshfs file system are still polluting mtab, and if we don't remove
them here, then on restarting the VM we still won't be able to use
Linux files in the files app. Hence we remove the old mounts at session
startup if it's an unclean startup.

Bug: 1057899
Change-Id: Ib5082c973e245800ac976efcecfd0aad96fe998d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089538
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Auto-Submit: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Cr-Commit-Position: refs/heads/master@{#748081}