[Rpm-maint] [rpm-software-management/rpm] Add an alternative, enhanceable form of rpm.execute() with io redirect capabilities (PR #3236)

[Miro Hrončok]

@hroncok commented on this pull request.



> +#### execute({table} [, stdout [, stderr]])
+
+Execute an external command (rpm >= 4.20)
+This is an alternative form of rpm.execute() that takes the command and any
+arguments as a single Lua table.
+
+Standard output and/or error can be optionally redirected to named path,
+such as commonly `/dev/null` to suppress output.
+
+```
+rpm.execute({'ls', '-l', '/''})
+```
+
+Redirect standard error to `/dev/null`:
+```
+rpm.execute({'systemctl', 'restart', 'httpd'}, nil, '/dev/null')

But if you don't like that, I consider `spawn` a good name for this function. It spawns a process, the name resembles `posix_spwan` but at the same time it isn't exactly `posix_spwan`, so I would not expect the same API as `posix_spwan`. 

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