Role service-fastd: use own systemd unit fastd@.service

- original uses %I which does not escaping, so dashes will be replaced
by slashes
- use %i instead of %I

roles/service-fastd/tasks/main.yml

@@ -12,3 +12,12 @@
   systemd:
     name: fastd
     masked: yes
+
+- name: write systemd unit fastd@.service
+  template:
+    src: fastd@.service.j2
+    dest: /etc/systemd/system/fastd@.service
+    owner: root
+    group: root
+    mode: 0644
+  notify: reload systemd

roles/service-fastd/templates/fastd@.service.j2

@@ -0,0 +1,11 @@
+[Unit]
+Description=Fast and Secure Tunnelling Daemon (connection %i)
+After=network.target
+
+[Service]
+Type=notify
+ExecStart=/usr/bin/fastd --syslog-level info --syslog-ident fastd@%i -c /etc/fastd/%i/fastd.conf
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=multi-user.target