Provide more info in failed gsm_connection test.

[amalinowski75]

Bug Description

Test: com.canonical.certification::mobilebroadband/gsm_connection.com.canonical.certification::mobilebroadband/gsm_connection (from (empty))

When the test fails it provides very enigmatic output: connected GSM interface seems to be And nothing more.

To Reproduce

Run com.canonical.certification::mobilebroadband/gsm_connection.com.canonical.certification::mobilebroadband/gsm_connection on a device without SIM card in the slot and see the result.

Environment

• OS: 20.04 Desktop
• Checkbox Type: Debian
• Checkbox Version: 4.0.1
• Hardware being tested: https://certification.canonical.com/hardware/202112-29832/submission/381972/

Relevant log output

`connected GSM interface seems to be `

ubuntu@ubuntu-SSE:~$ sudo mmcli -L
    /org/freedesktop/ModemManager1/Modem/2 [QUALCOMM INCORPORATED] QUECTEL Mobile Broadband Module
ubuntu@ubuntu-SSE:~$ 

ubuntu@ubuntu-SSE:~$ sudo nmcli
cdc-wdm0: disconnected
        "cdc-wdm0"
        gsm (qmi_wwan, option), hw

wlp4s0: disconnected
        "Qualcomm Atheros QCA6174"
        wifi (ath10k_pci), 00:0E:8E:A2:14:81, hw, mtu 1500

Additional context

No response

[syncronize-issues-to-jira[bot]]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1506.

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