Hi! I'm currently trying a couple different tests provided in flent, and stumbled across the `rrul_prio` test.

Firstly, I'm curious as to what the labels `BE`, `BE2`, `BE3` and `BE4` stand for - I suppose, the BE should be Best Effort(?)
And for the ping section - the difference between `BE1` and `PRIO`?
Further, their respective ToS or DSCP codes, as I was unable to find them in the docs, to consider them in possible network configurations.

Also, when running the test (mn.h1 and mn.h2 refering to local entries in `/etc/hosts`, connections can be established):
`sudo flent rrul_prio -p all_scaled --local-bind mn.h1 -l 60 -H mn.h2 -o rrul_prio2.pdf -v`
I find the following error:

```
Ping (ms) ICMP PRIO: Starting watchdog with timeout 71
Started TimerRunner idx 17 ('Watchdog [Ping (ms) ICMP PRIO]')
Started PingRunner idx 17 ('Ping (ms) ICMP PRIO')
WARNING: Program exited non-zero.
Runner class: IrttRunner
Command: /usr/bin/irtt client -o - --fill=rand -Q -d 70s -i 0.2s  --dscp=0x10,0x10 --local=mn.h1  mn.h2
Return code: 2
Stdout: 
Stderr: Error: strconv.ParseInt: parsing "0x10,0x10": invalid syntax

WARNING: Unable to parse irtt JSON output: Expecting value: line 1 column 1 (char 0)
WARNING: Command produced no valid data.
Runner class: IrttRunner
Command: /usr/bin/irtt client -o - --fill=rand -Q -d 70s -i 0.2s  --dscp=0x10,0x10 --local=mn.h1  mn.h2
Return code: 2
Stdout: 
Stderr: Error: strconv.ParseInt: parsing "0x10,0x10": invalid syntax
```

Searching a bit through the test config files of your other tests, I found that normally your markings would be configured with DSCP names rather than hex values, maybe there lies the problem?

The plot seems to include data from all connections, despite the Error (as far as I'm aware)

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