Use /dev/null for stdout/stderr in libzfs_run_process().

Simply closing the stdout and/or stderr file descriptors for
the child process can have bad side effects if for example
the child writes to stdout/stderr after open()ing a file.
The open() call might have returned the same file descriptor
one would usually expect for stdout/stderr (1 and 2), thereby
causing mis-directed writes.

Signed-off-by: Brian Behlendorf <[email protected]>
Issue #190

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