`wwan_resource` output is not RFC822 compliant if firmware revision is multi-line

[pieqq]

Bug Description

On a device (202408-34247) with a MTK WWAN, there is an issue when the wwan_resource job is launched:

WARNING:plainbox.ctrl:local script com.canonical.certification::wwan_resource returned invalid RFC822 data: Unexpected non-empty line: '0060\n' (line 6)

This is because one of the field is not escaped and runs on multiple lines (see logs below)

To Reproduce

1. Launch checkbox-cli run com.canonical.certification::wwan_resource
2. Observe the firmware_revision field runs on two lines instead of one

Environment

Checkbox dev

Relevant log output

wwan_resource outcome:

ubuntu@localhost:~$ checkbox-cli run com.canonical.certification::wwan_resource
Skipped file: /usr/share/checkbox-provider-base/units/camera/README.rst
Skipped file: /usr/share/checkbox-provider-base/units/snapd/README.md
Skipped file: /usr/share/checkbox-provider-base/units/stress/suspend_cycles_reboot.md
===========================[ Running Selected Jobs ]============================
==============[ Running job 1 / 1. Estimated time left: 0:00:03 ]===============
--------------------[ Gather device info about WWAN modems ]--------------------
ID: com.canonical.certification::wwan_resource
Category: com.canonical.certification::wwan
... 8< -------------------------------------------------------------------------
mm_id: 1
hw_id: 357953120018642
manufacturer: mtk
model: MBIM [14C0:4D75]
firmware_revision: RMM-G1.10.00.060_GC
0060
hardware_revision: MTK2

------------------------------------------------------------------------- >8 ---
Outcome: job passed
local script com.canonical.certification::wwan_resource returned invalid RFC822 data: Unexpected non-empty line: '0060\n' (line 6)
Finalizing session that hasn't been submitted anywhere: checkbox-run-2024-09-26T07.12.55
==================================[ Results ]===================================
 ☑ : Gather device info about WWAN modems

MMCLI info:

ubuntu@localhost:~$ mmcli -L
    /org/freedesktop/ModemManager1/Modem/1 [mtk] MBIM [14C0:4D75]

### Additional context

_No response_

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

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1589.

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