Alexander A. Klimov a8c9d19dae Icinga DB: ensure icinga:*command:argument#order is an int
The config parser requires *Command#arguments#order to be a Number, i.e. 42,
4.2 or even "4.2". That's int-casted where needed, now also for Icinga DB.

Before:

```
object CheckCommand "9117" {
	command = [ "true" ]
	arguments = {
		"4.2" = { order = "4.2" }
	}
}
```

2022-01-03T13:25:07.166+0100	FATAL	icingadb	json: cannot unmarshal string into Go value of type int64
2022-01-03 13:28:19 +01:00
..
2019-11-02 14:00:24 +01:00