Audio false alarm on Eoan

[Taihsiang Ho]

When running SRU, I found an audio new failure with the proposed kernel on several platforms:

kernel: 5.3.0-26.28-generic
image: eoan
checkbox PPA: stable
affected hardware:
  - 201903-26932 - Dell Precision 5540 - Berlinetta P CFL-R
  - 201810-26519 - Dell Inspiron 3481 - Loki N3 V3 KBL
  - 201708-25694 - Dell XPS 13 9370 - Italia 13

Ref the test case result: https://certification.canonical.com/hardware/201903-26932/submission/157033/test/102/result/11900726/

Connection failure: Connection refused
pa_context_connect() failed: Connection refused
Traceback (most recent call last):
  File "/tmp/nest-d4pp1nwz.67ca0876fe70b492c8578617ae5ac5cc72bcb1d912c546657c0f4a9eb2a15191/audio_settings", line 9, in <module>
    sys.exit(main())
  File "/usr/lib/python3/dist-packages/checkbox_support/scripts/audio_settings.py", line 363, in main
    store_audio_settings(settings_file)
  File "/usr/lib/python3/dist-packages/checkbox_support/scripts/audio_settings.py", line 215, in store_audio_settings
    env=unlocalized_env())
  File "/usr/lib/python3.7/subprocess.py", line 411, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.7/subprocess.py", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['pactl', 'info']' returned non-zero exit status 1.

ubuntu@201903-26932:~$ dpkg -l "*plainbox*" "*checkbox*"
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==================================-========================-============-=======================================================
ii checkbox-ng 1.6.0~ppa~ubuntu19.10.1 all CheckBoxNG test runner
un plainbox <none> <none> (no description available)
ii plainbox-provider-checkbox 0.50.0~ppa~ubuntu19.10.1 amd64 CheckBox provider for PlainBox
ii plainbox-provider-resource-generic 0.42.0~ppa~ubuntu19.10.1 amd64 CheckBox generic resource jobs provider
ii plainbox-provider-sru 1.14.0~ppa~ubuntu19.10.1 all CheckBox SRU jobs provider
ii python3-checkbox-ng 1.6.0~ppa~ubuntu19.10.1 all CheckBoxNG test runner (Python 3 library)
ii python3-checkbox-support 0.43.0~ppa~ubuntu19.10.1 all collection of Python modules used by PlainBox providers
un python3-plainbox <none> <none> (no description available)
ubuntu@201903-26932:~$ uname -a
Linux 201903-26932 5.3.0-26-generic #28-Ubuntu SMP Wed Dec 18 05:37:46 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@201903-26932:~$