Add more service VMs, disable default share

Add VMs for DNS, IRC, logging and web.

Disabling the default Vagrant synced folder.
Add upgrade playbook

Update and upgrade servers as part of a separate playbook.
Update group variables

Update to use dictionary values.
MOTD script

Add MOTD script for CLI users which echos the /etc/motd.
Add logging server role

Adding remote syslog server and Kibana. Still requires Logstash and
further nginx configuration.
Adding logging configuration

Changes the default rsyslog configuration for each VM, still requires
configuration to have it log remotely.
Modify time role for group variables

Group variables are now a dict, so these changes reflect that.

Additionally, the file module should be using path for the link state.
DNS Server role

This adds a role for an authoritative DNS server using PowerDNS.

The playbook needs to gather all the hosts first so that they are added
to the internal zone automatically.

Further work needs to be done to configure a recursive DNS server.
Update Ansible hosts

This reflects the current Ansible hosts in use. Auto-discovery may be
helpful for this in future work.