Restore parallel waiting to Route53 plugin (#5712)

* Bring back parallel updates to route53.

* Re-add try

* Fix TTL.

* Remove unnecessary wait.

* Add pylint exceptions.

* Add dummy perform.

* review.feedback

* Fix underscore.

* Fix lint.

certbot-dns-route53/certbot_dns_route53/dns_route53.py

@@ -42,14 +42,26 @@ class Authenticator(dns_common.DNSAuthenticator):
     def _setup_credentials(self):
         pass
 
-    def _perform(self, domain, validation_domain_name, validation):
+    def _perform(self, domain, validation_domain_name, validation): # pylint: disable=missing-docstring
-        try:
+        pass
-            change_id = self._change_txt_record("UPSERT", validation_domain_name, validation)
 
-            self._wait_for_change(change_id)
+    def perform(self, achalls):
+        self._attempt_cleanup = True
+
+        try:
+            change_ids = [
+                self._change_txt_record("UPSERT",
+                  achall.validation_domain_name(achall.domain),
+                  achall.validation(achall.account_key))
+                for achall in achalls
+            ]
+
+            for change_id in change_ids:
+                self._wait_for_change(change_id)
         except (NoCredentialsError, ClientError) as e:
             logger.debug('Encountered error during perform: %s', e, exc_info=True)
             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):
         try: