DNS Masq Netbox updater

NetBox updater service is designed to function as a simple webserver waiting for WebHook calls from a NetBox instance. After receiving GET /update-dnsmasq API query it calls NetBox, lists all defined IP addresses with DNS names and creates a new /etc/dnsmasq.d/netbox.conf file. The file defines all retrieved hosts as A records. Then the dnsmasq.service is restarted.