Title: #5490: [Backport][ipa-4-9] Better support for unreadable NSS database
This PR was opened automatically because PR #5489 was pushed to master and backport to
ipa-4-9 is required.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5490/head:pr5490
git checkout pr5490