Fix Pylint upgrade issues

* Remove unsupported pylint disable options
    * star-args removed in Pylint 1.4.3
    * abstract-class-little-used removed in Pylint 1.4.3

* Fixes new lint errors

* Copy dummy-variable-rgx expression to new ignored-argument-names expression to ignore unused funtion arguments

* Notable changes
    * Refactor to satisfy Pylint no-else-return warning
    * Fix Pylint inconsistent-return-statements warning
    * Refactor to satisfy consider-iterating-dictionary
    * Remove methods with only super call to satisfy useless-super-delegation
    * Refactor too-many-nested-statements where possible
    * Suppress type checked errors where member is dynamically added (notably derived from josepy.JSONObjectWithFields)
    * Remove None default of func parameter for ExitHandler and ErrorHandler

Resolves #5973

certbot-dns-route53/certbot_dns_route53/dns_route53.py

@@ -44,7 +44,7 @@ class Authenticator(dns_common.DNSAuthenticator):
     def _setup_credentials(self):
         pass
 
-    def _perform(self, domain, validation_domain_name, validation): # pylint: disable=missing-docstring
+    def _perform(self, domain, validation_name, validation): # pylint: disable=missing-docstring
         pass
 
     def perform(self, achalls):
@@ -65,9 +65,9 @@ class Authenticator(dns_common.DNSAuthenticator):
             raise errors.PluginError("\n".join([str(e), INSTRUCTIONS]))
         return [achall.response(achall.account_key) for achall in achalls]
 
-    def _cleanup(self, domain, validation_domain_name, validation):
+    def _cleanup(self, domain, validation_name, validation):
         try:
-            self._change_txt_record("DELETE", validation_domain_name, validation)
+            self._change_txt_record("DELETE", validation_name, validation)
         except (NoCredentialsError, ClientError) as e:
             logger.debug('Encountered error during cleanup: %s', e, exc_info=True)