kra_is_enabled() is defined in:
ipaserver/plugins/vault.py
and used in:
ipaserver/install/kra.py
ipaserver/install/server/upgrade.py
ipaserver/plugins/vault.py
ipaserver/plugins/dogtag.py
ipatests/test_xmlrpc/test_vault_plugin.py

Actions
- review all code using kra_is_enabled() to see what they expect to receive
- if checking if the cluster is KRA enabled, fine
- if it expects KRA on the same master, fix
- make both queries possible