tstest/natlab/vmtest: close unused pipe read FD to avoid leak

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There are two copies of the read file descriptor (parent & child).
Since the parent copy is unused, we can close it after fork.

Updates #cleanup

Change-Id: Id789e0a04970c9fb8eaeed1f299aa25f29fcf48c
Signed-off-by: Francois Marier <francois@tailscale.com>

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