r/collectd-nut: Configure nut plugin for collectd

The *nut* plugin for *collectd* fetches data from Network UPS Tools.
This is useful for monitoring UPS statistics over time.

roles/collectd-nut/defaults/main.yml

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+collectd_load_nut_plugin: true
+collectd_nut_ups: []

roles/collectd-nut/handlers/main.yml

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+- name: restart collectd
+  service:
+    name: collectd
+    state: restarted

roles/collectd-nut/tasks/main.yml

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+- name: ensure collectd nut plugin is installed
+  package:
+    name: collectd-nut
+    state: present
+  tags:
+  - install
+
+- name: ensure collectd nut plugin is configured
+  template:
+    src: collectd-nut.conf.j2
+    dest: /etc/collectd.d/nut.conf
+    mode: u=rw,go=r
+  notify:
+  - restart collectd
+  tags:
+  - collectd-config
+
+- name: ensure collectd is allowed to connect to nut
+  seboolean:
+    name: collectd_tcp_network_connect
+    state: true
+    persistent: true
+  notify:
+  - restart collectd
+  tags:
+  - selinux

roles/collectd-nut/templates/collectd-nut.conf.j2

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+{% if collectd_load_nut_plugin %}
+LoadPlugin nut
+
+{% endif %}
+<Plugin nut>
+{% for ups in collectd_nut_ups %}
+    UPS "{{ ups }}"
+{% endfor %}
+</Plugin>