tools: Fix PEP8.

src/tools.py

@@ -375,7 +375,10 @@ def parse_command_line(cmd):
             word, rest = _parse_next_word(rest)
             words.append(word)
     except Exception as e:
-        logger.error(f"{parse_command_line}: Failed to parse command line '{cmd}'")
+        logger.error(
+            f"{parse_command_line}: " +
+            f"Failed to parse command line '{cmd}'"
+        )
         logger.error(f"  exception raise {e}")
         return []