Merge ~troyanov/maas:backport-lp1929478-to-3.2 into maas:3.2

[Anton Troyanov]

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)

[Anton Troyanov (troyanov)]

self approve backport MP

review: Approve

diff --git a/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py b/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
index a4c791f..4964f08 100755
--- a/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
+++ b/src/metadataserver/builtin_scripts/commissioning_scripts/bmc_config.py
@@ -242,7 +242,7 @@ class IPMIBase(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