Silence pylint

Silence pylint in specific places where we're doing slightly unusual
or dodgy, but correct.

scripts/abi_check.py

@@ -255,7 +255,9 @@ def run_main():
         )
         return_code = abi_check.check_for_abi_changes()
         sys.exit(return_code)
-    except Exception:
+    except Exception: # pylint: disable=broad-except
+        # Print the backtrace and exit explicitly so as to exit with
+        # status 2, not 1.
         traceback.print_exc()
         sys.exit(2)