r/tftp: Deploy TFTP server

The *tftp* role installs the *tftp-server* package.  There is
practically no configuration for the TFTP server.  It "just works" out
of the box, as long as its target directory exists.

roles/tftp/tasks/main.yml

@@ -0,0 +1,39 @@
+- name: ensure tftp-server is installed
+  package:
+    name: tftp-server
+    state: present
+  tags:
+  - install
+
+- name: ensure tftpboot directory exists
+  file:
+    path: /var/lib/tftpboot
+    owner: root
+    group: root
+    mode: ug=rwx,o=rx
+    state: directory
+    force: false
+  tags:
+  - datadir
+
+- name: ensure tftp server starts at boot
+  systemd:
+    name: tftp.socket
+    enabled: true
+  tags:
+  - service
+- name: ensure tftp server is running
+  systemd:
+    name: tftp.socket
+    state: started
+  tags:
+  - service
+
+- name: ensure firewall is configured for tftp
+  firewalld:
+    service: tftp
+    permanent: true
+    immediate: true
+    state: enabled
+  tags:
+  - firewall