[Rpm-maint] [rpm-software-management/rpm] Add rpm.spawn() Lua API (PR #3241)

[Miro Hrončok]

@hroncok commented on this pull request.



> +
+#### spawn({command} [, {actions}])
+
+Spawn, aka execute, an external program. (rpm >= 4.20)
+
+`{command}` is a table consisting of the command and its arguments.
+An optional second table can be used to pass various actions related
+to the command execution, currently supported are:
+
+| Action  | Argument(s) | Description
+|---------|----------------------
+| `stdin` | path        | Redirect standard input to path
+| `stdout`| path        | Redirect standard output to path
+| `stderr`| path        | Redirect standard error to path
+
+Returns the command exit status.

I see:

```lua
> rpm.execute('true')
0,0
> rpm.execute('false')
nil	"exit code"	256,0
```

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