feat(job): add parameter to close stdin

Some programs behave differently when they detect that stdin is being
piped. This can be problematic when these programs are used with the job
control API where stdin is attached, but not typically used. It is
possible to run the job using a PTY which circumvents this problem, but
that includes a lot of overhead when simply closing the stdin pipe would
suffice.

To enable this behavior, add a new parameter to the jobstart options
dict called "stdin" with two valid values: "pipe" (the default)
implements the existing behavior of opening a channel for stdin and
"null" which disconnects stdin (or, if you prefer, connects it to
/dev/null). This is extensible so that other modes can be added in the
future.

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