Configure python and server fqdn as part of provisioner

The installation stage should assume that the provisioned nodes have
all the basic installation and configuration completed. Examples are

- python is available on nodes so Ansible can be used
- server fqdn is added to /etc/hosts
- if running in offline mode, sources.list is updated with server fqdn

Change-Id: If74cc945d88f3512511a6c6d845c2bbbefc5737b
3 files changed