Merge ~seyeongkim/maas:lp1929478_to_3.1 into maas:3.1

[Seyeong Kim]

Fix utf-8 character error when bmc-config

Related LP and article

https://bugs.launchpad.net/bugs/1892983
https://bugs.launchpad.net/bugs/1929478
https://discourse.maas.io/t/maas-failed-commissioning/4904
(cherry picked from commit 3eec5b5161515a23f58c72638a5ff8aac7486622)

[MAAS Lander (maas-lander)]

UNIT TESTS
-b lp1929478_to_3.1 lp:~seyeongkim/maas/+git/maas into -b 3.1 lp:~maas-committers/maas

STATUS: SUCCESS
COMMIT: f1ff1bc22d205e356981b2ba3d11ba5677788dc0

review: Approve

[Jack Lloyd-Walters (lloydwaltersj)]

+1

review: Approve

[MAAS Lander (maas-lander)]

UNABLE TO START LANDING

STATUS: MISSING COMMIT MESSAGE

[MAAS Lander (maas-lander)]

LANDING
-b lp1929478_to_3.1 lp:~seyeongkim/maas/+git/maas into -b 3.1 lp:~maas-committers/maas

STATUS: FAILED BUILD
LOG: http://maas-ci.internal:8080/job/maas-tester/1975/consoleText

diff --git a/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py b/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
index 42e4c79..4da0512 100755
--- a/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
+++ b/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
@@ -190,7 +190,7 @@ class IPMI(BMCConfig):
             )
             raise
         section = None
-        for line in proc.stdout.decode().splitlines():
+        for line in proc.stdout.decode(errors="surrogateescape").splitlines():
             line = line.split("#")[0].strip()
             if not line:
                 continue