[freeipa PR#758][synchronized] install: fix CA-less PKINIT

[HonzaCholasta]

   URL: https://github.com/freeipa/freeipa/pull/758
Author: HonzaCholasta
 Title: #758: install: fix CA-less PKINIT
Action: synchronized

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/758/head:pr758
git checkout pr758