Pacify Pylint

Pass Pylint by cleaning up the code where possible and silencing
Pylint where I know better.

No behavior change.

scripts/generate_psa_constants.py

@@ -8,7 +8,6 @@ of that program.
 
 import os
 import re
-import sys
 
 OUTPUT_TEMPLATE = '''\
 /* Automatically generated by generate_psa_constant.py. DO NOT EDIT. */
@@ -224,12 +223,11 @@ class MacroCollector:
             return
         elif (name.startswith('PSA_ERROR_') or name == 'PSA_SUCCESS') \
            and not parameter:
-            if name in [
-                        'PSA_ERROR_UNKNOWN_ERROR',
+            if name in ['PSA_ERROR_UNKNOWN_ERROR',
                         'PSA_ERROR_OCCUPIED_SLOT',
                         'PSA_ERROR_EMPTY_SLOT',
                         'PSA_ERROR_INSUFFICIENT_CAPACITY',
-                        ]:
+                       ]:
                 # Ad hoc skipping of deprecated error codes, which share
                 # numerical values with non-deprecated error codes
                 return