ethernet/hotplug-{{ interface }} fails without potential latency

[scotthu27]

Bug Description

The ethernet functions normally even though the test case fails repeatedly.

Possible reason seems to be the test case starts pinging on cable detection, ignoring the potential latency between cable plug-in and system network setup. See implementation of the test case:

$ eth_hotplugging.py {{ interface }} && gateway_ping_test.py --interface {{ interface }}

This could be fixed by adding few seconds of latency in between. For example:

$ eth_hotplugging.py {{ interface }} && sleep 5 && gateway_ping_test.py --interface {{ interface }}

The SKU could pass the modified test case.

To Reproduce

1. run ethernet/hotplug-{{ interface }} test

Environment

OS: jammy
checkbox type: debian
checkbox version: 4.0.0.dev194

Relevant log output

[Checkbox job `com.canonical.certification::ethernet/hotplug-enp2s0` output]

stdout
------
Press enter and unplug the ethernet cable from the port enp2s0 of the System.
After 15 seconds plug it back in.
Checkbox session may be interrupted but it should come back up.
Waiting for cable to get disconnected.
...Cable unplugged!
Waiting for the cable to get connected.
..........Cable detected!
Failed to find a host to ping on interface enp2s0
FAIL: Unable to ping any host with the above interfaces

stderr
------
ERROR:root:Could not find def gateway info in /proc
WARNING: systemd-networkd is not running, output will be incomplete.

Failed to query link bit rates: Unit dbus-org.freedesktop.network1.service not found.
Failed to query link DHCP leases: Unit dbus-org.freedesktop.network1.service not found.

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1410.

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