Deprecate option for old api_export_size bug

This change deprecates the option to workaround the old bug. The bug
was fixed during Newton cycle and is fixed in all versions currently
maintained.

Related-Bug: #1573141
Change-Id: I88ca5b481f7728da38f53c4e67710314e78da24d
diff --git a/designate_tempest_plugin/config.py b/designate_tempest_plugin/config.py
index f4ca708..69be727 100644
--- a/designate_tempest_plugin/config.py
+++ b/designate_tempest_plugin/config.py
@@ -79,6 +79,8 @@
                 "Must be set to True starting from Rocky release."),
     cfg.BoolOpt('bug_1573141_fixed',
                 default=True,
+                deprecated_for_removal=True,
+                deprecated_reason='This bug was fixed in 3.0.0',
                 help="Is https://bugs.launchpad.net/designate/+bug/1573141 "
                 "fixed"),
     cfg.BoolOpt('bug_1932026_fixed',