lib.sh: workaround "sudo ... &" corruption issue 1151 for stable-v2.2

Should finally fix terminal corruption issue thesofproject#1151.

Commit 8341638 was a good workaround but it was applied only for
Zephyr's mtrace.

- Apply the same workaround for stable-v2.2 sof-logger
- Explain better in the source what causes the corruption
- Change owner of mtrace.txt logs to "ubuntu" instead of root.

Signed-off-by: Marc Herbert <[email protected]>

case-lib/lib.sh

@@ -394,11 +394,13 @@ func_mtrace_collect()
 
     local mtraceCmd=("$MTRACE")
     dlogi "Starting ${mtraceCmd[*]} >& $clogfile &"
+
     # Cleaned up by func_exit_handler() in hijack.sh
-    # The use of 'bash -c' is a workaround for below issue:
-    # https://github.com/thesofproject/sof-test/issues/1151
+    #
+    # We need "bash -c" because "sudo ... &" corrupts the terminal among
+    # other issues, see bug #1151.
     # shellcheck disable=SC2024
-    sudo bash -c "${mtraceCmd[*]} >& $clogfile &"
+    sudo bash -c "${mtraceCmd[*]} &" >& "$clogfile"
 }
 
 func_lib_log_post_process()
@@ -461,9 +463,13 @@ func_sof_logger_collect()
     # shellcheck disable=SC2206
     local loggerCmd=("$SOFLOGGER" $logopt -l "$ldcFile")
     dlogi "Starting ${loggerCmd[*]} > $logfile &"
+
     # Cleaned up by func_exit_handler() in hijack.sh
+    #
+    # We need "bash -c" because "sudo ... &" corrupts the terminal among
+    # other issues, see bug #1151.
     # shellcheck disable=SC2024
-    sudo "${loggerCmd[@]}" > "$logfile" &
+    sudo bash -c "${loggerCmd[*]} &" > "$logfile"
 }
 
 SOF_LOG_COLLECT=0