Improve/fix RFC3442 entries and add tests

- Generate the rfc3442 words using a filter plugin, instead of Jinja
- basic sanity test when running plugin standalone
- Improve testing by creating/binding to a bridge0 interface in
  molecule docker container, then verifying that it's running
- Add ntp option
- multiplatform support

Change-Id: I7c2c3081e8919174dd29b3ab2fdd27b4f6eb843a
diff --git a/handlers/main.yml b/handlers/main.yml
index 6fbce94..161f3e1 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -8,3 +8,8 @@
   service:
     name: "{{ dhcpd_service }}"
     state: restarted
+
+- name: tftpd-restart
+  service:
+    name: "{{ tftpd_service }}"
+    state: restarted