Added friendly_networks variable to denote whitelisted networks

because it's not available in a stable ansible release yet

In order to check the version of the linux distribution we need to
set `gather_facts` to True.

Closes #73.

Instead of sending email to {{ admin_email }} we send them to root user.
These emails will be redirected to the appropriate user via
mail_virtual_aliases variables

Apticron is configured to send email to {{ admin_email }}

ignoreip field inside /etc/fail2ban/jail.local is populated with
server_ip_address variable

Sovereign does not currently use jabber/xmpp or insecure smtp.

Refs #39

Fix CAcert usage in postfix and dovecot

Removed your hardcoded server IP

The old action would generate a crontab job for `* 3 * * *`, which means every minute at 3am, so 60 times per day.