Refactor snapshotting #561
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We were writing an extra (large) filesystem snapshot to disk in a tarball at the start of each stage. We don't need the base FS saved as a tarball anywhere.
This refactors our snapshotting to separate creating a tar from deciding what to put in the tar, so we can skip writing it during the initial FS layer.
With this change: "Writing tar file": 2118800
Without: "Writing tar file": 1560463300