riotctrl_shell.netif: fix for multiple interfaces with netstats #14510
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Contribution description
This provides a fix to
riotctrl_shell.netif
for when there is more than one interface and network statistics are provided. I also added a regression test for that.Testing procedure
cd dist/pythontools/riotctrl_shell; tox
, or just lettools-test
do its thing :-)Issues/PRs references
Required for the test integration of release spec 10-icmpv6-error (see RIOT-OS/Release-Specs#167).