[Rpm-maint] [rpm-software-management/rpm] RFE: implement wrapper for posix.fork()+posix.exec() (#389)

[Igor Gnatenko]

Many of packages which use filetriggers (e.g glibc and systemd) use following construction:

```lua
pid = posix.fork()
if pid == 0 then
  assert(posix.exec("/foo/bar"))
elseif pid > 0 then
  posix.wait(pid)
end
```

this is just not user friendly and we could implement something like `rpm.execute([args])` which would do all this boring things. Another option is definitely to create macro for this (like `%rpm_lua_execute`), but it's probably not user-friendly.

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