Title: #927: WebUI: Cockpit integration
Link to the cockpit is placed to each host details page in case
the Cockpit is installed on the server.
Showing or hiding cockpit link is possible because of Cockpit's API
which provides public URL for check whether Cockpit is the software
which listen on given port.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/927/head:pr927
git checkout pr927