Title: #5998: [Backport][ipa-4-6] extdom: return LDAP_NO_SUCH_OBJECT if domains differ
This PR was opened automatically because PR #5991 was pushed to master and backport to
ipa-4-6 is required.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5998/head:pr5998
git checkout pr5998