[Rpm-maint] [rpm-software-management/rpm] Rpmlua - missing features (Issue #2095)

[mkoncek]

Consider the following script:
```lua
print(arg[-1])
print(arg[0])
for k, v in ipairs(arg) do
        print(k, v)
end
```
And invoking it:
```
[root at 55eace74b25d javapackages]# rpmlua ./java-utils/java_remove_symbols.lua -- param -p flag
-1      nil
0       nil
1       ./java-utils/java_remove_symbols.lua
2       param
3       -p
4       flag
[root at 55eace74b25d javapackages]# lua ./java-utils/java_remove_symbols.lua -- param -p flag
-1      lua
0       ./java-utils/java_remove_symbols.lua
1       --
2       param
3       -p
4       flag

```
`rpmlua` behaves differently from `lua`, both in using `--` as separator and in numbering the `arg` parameter. I can separate the functions from arg handling code to make it work with both `lua` and `rpmlua` but I see this difference in behaviour as a problem. Although I doubt you are going to change it.

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