r/hass-dhcp: Clean up DHCP/DNS service

The production deployment of *dnsmasq* for Home Assistant has deviated
from how the *hass-dhcp* role configures it.  Bringing the role back in
sync with how things really are.

roles/hass-dhcp/handlers/main.yml

@@ -2,3 +2,7 @@
   service:
     name: dnsmasq
     state: restarted
+- name: reload firewalld
+  command: firewall-cmd --reload
+- name: save firewalld configuration
+  command: firewall-cmd --runtime-to-permanent