Add keystone db connection details

Change-Id: I17477cd87e7bb7f0a8a78ea76ba26c5858af962b
Put some order on os-refresh-config systemd

cloud-init is populating the file /var/lib/cloud/data/cfn-init-data
with metadata and needs to happen before os-refresh-config is run
which in turn needs to happen before the cfn-hup cronjob.