Add logwatch to the monitoring role to email daily log summaries

Based on playbook from https://github.com/phred/5minbootstrap

roles/monitoring/tasks/logwatch.yml

+- name: Install logwatch
+  apt: pkg=logwatch state=installed
+
+- name: Configure logwatch to email {{ main_user_name }}@{{ domain }} daily
+  action: lineinfile dest=/etc/cron.daily/00logwatch regexp="^/usr/sbin/logwatch" line="/usr/sbin/logwatch --output mail --mailto {{ main_user_name }}@{{ domain }} --detail high" state=present create=yes

roles/monitoring/tasks/main.yml

-- include: monit.yml tags=monit
+- include: monit.yml tags=monit
+- include: logwatch.yml tags=logwatch