redhat_subscription: Fix usage of ConfigParser (#54815)

changelogs/fragments/redhat_subscription_use_strings_for_yum_plugin_configs.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- redhat_subscription - For compatibility using the redhat_subscription module on hosts set to use a python 3 interpreter, use string values when updating yum plugin configuration files.

lib/ansible/modules/packaging/os/redhat_subscription.py

@@ -260,9 +260,9 @@ class RegistrationBase(object):
             cfg.read([tmpfile])
 
             if enabled:
-                cfg.set('main', 'enabled', 1)
+                cfg.set('main', 'enabled', '1')
             else:
-                cfg.set('main', 'enabled', 0)
+                cfg.set('main', 'enabled', '0')
 
             fd = open(tmpfile, 'w+')
             cfg.write(fd)