Fix syntax error for Python 2.6 (#47635)

* Fix syntax error for Python 2.6

* Removing consul.py from pylint/ignore.txt

lib/ansible/modules/clustering/consul.py

@@ -475,7 +475,7 @@ class ConsulCheck(object):
         if duration:
             duration_units = ['ns', 'us', 'ms', 's', 'm', 'h']
             if not any((duration.endswith(suffix) for suffix in duration_units)):
-                duration = "{}s".format(duration)
+                duration = "{0}s".format(duration)
         return duration
 
     def register(self, consul_api):

test/sanity/pylint/ignore.txt

@@ -28,7 +28,6 @@ lib/ansible/modules/cloud/webfaction/webfaction_db.py ansible-format-automatic-s
 lib/ansible/modules/cloud/webfaction/webfaction_domain.py ansible-format-automatic-specification
 lib/ansible/modules/cloud/webfaction/webfaction_mailbox.py ansible-format-automatic-specification
 lib/ansible/modules/cloud/webfaction/webfaction_site.py ansible-format-automatic-specification
-lib/ansible/modules/clustering/consul.py ansible-format-automatic-specification
 lib/ansible/modules/monitoring/grafana_plugin.py ansible-format-automatic-specification
 lib/ansible/modules/net_tools/dnsmadeeasy.py ansible-format-automatic-specification
 lib/ansible/modules/net_tools/ipinfoio_facts.py ansible-format-automatic-specification