dnsmasq: disable ping for duplicate address detection

Some things don’t reply which holds up all requests for 3 seconds.

roles/dnsmasq/templates/00-options.conf.j2

@@ -1,11 +1,16 @@
 # disable DNS server
 port = 0
 
+# we are the only DHCP server
+dhcp-authoritative
+
+# don’t try to ping clients for duplicate IP check
+# has 3 s timeout during which no other requests are processed
+no-ping
+
 bind-interfaces
 interface = {{ interfaces | map(attribute='name') | join(',') }}
 
-dhcp-authoritative
-
 dhcp-option = option:dns-server,{{ dns | join(',') }}
 dhcp-option = option:ntp-server,{{ ntp | join(',') }}