ip_netns - invoke run_command passing list (#3822)

* ip_netns - invoke run_command passing list

* added changelog fragment

changelogs/fragments/3822-ip_netns-run-list.yaml

@@ -0,0 +1,2 @@
+minor_changes:
+    - ip_netns - calling ``run_command`` with arguments as ``list`` instead of ``str`` (https://github.com/ansible-collections/community.general/pull/3822).

plugins/modules/net_tools/ip_netns.py

@@ -76,7 +76,7 @@ class Namespace(object):
 
     def exists(self):
         '''Check if the namespace already exists'''
-        rc, out, err = self.module.run_command('ip netns list')
+        rc, out, err = self.module.run_command(['ip', 'netns', 'list'])
         if rc != 0:
             self.module.fail_json(msg=to_text(err))
         return self.name in out