Title: #5764: [Backport][ipa-4-9] Implement simple LDAP cache layer
This PR was opened automatically because PR #5681 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/5764/head:pr5764
git checkout pr5764