playbook: Add Router Advertisement re6stnet configuration role

playbook/roles/routeadv/meta/main.yml

+---
+dependencies:
+  - re6stnet
+  - role: package
+    package_name: dnsmasq
+    package_state: present

playbook/roles/routeadv/tasks/main.yml

+---
+- name: stop and disable dnsmasq (as it will be started by re6st)
+  service:
+    name: dnsmasq
+    state: stopped
+    enabled: no
+- name: add dnsmasq in re6stnet config
+  lineinfile:
+    dest: /etc/re6stnet/re6stnet.conf
+    insertafter: '^key'
+    line: 'daemon "exec dnsmasq -k8 - -i $re6stnet_iface -F ${re6stnet_subnet%/*},ra-only,${re6stnet_subnet#*/},1d"'
+  notify:
+    - restart re6stnet
+- name: configure re6stnet main interface
+  lineinfile:
+    dest: /etc/re6stnet/re6stnet.conf
+    insertafter: '^daemon'
+    line: 'main-interface {{ ansible_default_ipv4.interface }}'
+  notify:
+    - restart re6stnet
+- name: configure re6stnet additional interface
+  lineinfile:
+    dest: /etc/re6stnet/re6stnet.conf
+    insertafter: '^main-interface'
+    line: 'interface {{ ansible_default_ipv4.interface }}'
+  notify:
+    - restart re6stnet