Title: #933: Checks if Directory Server is installed and running before installation
In cases when IPA is installed in two steps (external CA), it's necessary to check (in
the second step) if Directory Server is running and if it's installed before continue
with the IPA installation.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/933/head:pr933
git checkout pr933